## how is white phosphorus made

December 12th, 2020

The phosphates were made by dissolving bones in strong acids and evaporating the solution. In fact, when the $$\ce{OH-}$$ ions of the teeth are replaced by $$\ce{F-}$$, the teeth resist decay. It gets harder and harder to separate the hydrogen from the phosphate making the pKa values increase in basicity: 2.12, 7.21, and 12.67. "Cover the battlefield with white smoke incendiary canisters that will weaken the enemy and burn any that wander too close." This makes white phosphorus. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. (1) Body-- sheet metal. Many workers in match factories developed brain damage and a disease called "phosphorus necrosis of the jaw" from exposure to toxic phosphorus vapors. Legal. [ "article:topic", "fundamental", "Allotropes", "isotopes", "showtoc:no", "Phosphorus", "phosphates", "Phosphorus compounds", "fertilizers", "phosphoros", "Hennig Brand", "Diphosphorus", "White Phosphorus", "Red Phosphorus", "Violet Phosphorus", "Black Phosphorus", "Phosphoric Acid" ], Red Phosphorus and Violet Phosphorus (Polymeric), information contact us at info@libretexts.org, status page at https://status.libretexts.org, $$H_3PO_4 + H_2O \rightarrow H_3O^+ + H_2PO^{4-}$$, $$H_2PO^{4-} + H_2O \rightarrow H_3O^+ + HPO_4^{2-}$$, $$H_2PO^{4-} + H_2O \rightarrow H_3O^+ + PO_4^{3-}$$, Overall: $$H_3PO_4 + 3H_2O \rightarrow 3 H_3O^+ + PO_4^{3-}$$. With solubility's this low, the resulting precipitates can then be filtered out. (In Greek mythology and tradition, Augerinus (Αυγερινός = morning star, still in use today), Hesperus or Hesperinus (΄Εσπερος or Εσπερινός or Αποσπερίτης = evening star, still in use today) and Eosphorus (Εωσφόρος = dawnbearer, not in use for the planet after Christianity) are close homologues, and also associated with The name Phosphorus in Ancient Greece was the name for the planet Venus and is derived from the Greek words (φῶς = light, φέρω = carry), which roughly translates as light-bringer or light carrier. Its glow occurs as a result of its vapors slowly being oxidized by the air. Phosphorus is mainly made from the bone-ashes or Phosphate Rock. White phosphorus munitions are weapons which use one of the common allotropes of the chemical element phosphorus. o 4 Heat the airtight container to at least 482 degrees F. The white phosphorus will slowly change into red phosphorus. White phosphorus consists of $$\ce{P4}$$ molecules, whereas the crystal structure of red phosphorus has a complicated network of bonding. Phosphorous was invented by accident by alchemist Hennig Brandt In 1669, while trying to make a philosopher's stone (a mythical substance which could turn base metal into gold). Waxy solids of white phosphorus are molecular crystals consisting of $$\ce{P4}$$ molecules. There are two main methods of making Phosphorus from bone-ashes or Phosphate Rock. It can be generated by heating white phosphorus (see below) to 1100 K and is very reactive with a bond-dissociation energy (117 kcal/mol or 490 kJ/mol) half that of dinitrogen ($$N_2$$). (5) Capabilities-- the average soldier can throw the grenade 30 meters. Phosphorus is quite reactive. This Youtube video link shows various experiments with white phosphorus, which help show the physical and chemical properties of it. Burning phosphorus with excess oxygen results in the formation of $$\ce{P4O10}$$. A yellow or white waxy substance will collect in the bottom of your water beaker. Pure phosphorus was once prescribed as a medicine and an aphrodisiac until doctors realized it was poisonous (Emsley). Brand's process was not very efficient; the salt he discarded actually contained most of the phosphorus. Phosphorous was invented by accident by alchemist Hennig Brandt In 1669, while trying to make a philosopher's stone (a mythical substance which could turn base metal into gold). It is insoluble in water, but diss… It is absorbed under water. From an industrial and economical view point, phosphorus-containing compounds are important commodities. The structure of $$\ce{P4}$$ can be understood by thinking of electronic configuration (s2 p3) of $$\ce{P}$$ in bond formation. Red phosphorus is made out from heated white phosphorus to 572˚F with no air. Since the time of Brandt, newer methods for producing phosphorus have been discovered, but they require much higher temperatures and more sophisticated equipment than the average individual possesses. Many workers in match factories developed brain damage and a disease called "phosphorus necrosis of the jaw" from exposure to toxic phosphorus vapors. Move the immersed white phosphorus from the airlock into the airtight container. Red phosphorus can be converted to white phosphorus by careful heating. Another example of the dangers of phosphorus is in the production of matches. Phosphorus is a nonmetal, solid at room temperature, and a poor conductor of heat and electricity. White phosphorus munitions are weapons which use one of the common allotropes of the chemical element phosphorus. Red Phosphorus has more atoms linked together in a network than white phosphorus does, which makes it much more stable. By analyzing their radioactive markers, Hershey and Chase found that the 32P remained with the bacteria, and the 35S remained in the supernatant liquid. The element phosphorus exists in three main forms, or allotropes white, red and black of which white phosphorus, consisting of four phosphorus atoms arranged an a tetrahedral molecule, is the most reactive. Phosphorus Food Guide Vegetables Low phosphorus 100 mg or less per serving Vegetables Serving size Phosphorus (mg) Asparagus 4 spears 32 Beans, green/yellow snap ½ cup 21 Beets (canned) ½ cup 33 Broccoli ½ cup 29 Cabbage (green or red) ½ cup8 Carrots ½ cup 24 Cauliflower ½ cup 22 Celery ½ cup 15 Corn, kernel ½ cup 69 Corn, creamed in can ½ cup 66 Cucumber (without skin) ½ cup 11 In this experiment, Alfred Hershey and Martha Chase used radioactive isotopes of phosphorus and sulfur to determine that DNA was genetic material and not proteins. In drug or supplement form, it's called phosphate. The middle number, (for example, 6-5-8) specifies the percentage of phosphorus compound in a fertilizer. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. Do this without breaking the external airlock seal. Sharing three electrons with other $$\ce{P}$$ atoms gives rise to the 6 $$\ce{P-P}$$ bonds, leaving a lone pair occupying the 4th position in a distorted tetrahedron. Currently, the process for manufacturing phosphorus does not involve large amounts of putrefied urine or bone ash. For more information, call the CDC Information Center at 1-800-232-4636. White phosphorus is pyrophoric(self-ignites on contact … This quality of the element makes it an ideal ingredient for matches because it is so flammable. Other matches, called safety matches, will ignite only when they are struck on a special rough surface containing certain chemicals. The first recorded isolation of phosphorus was by alchemist Hennig Brand in 1669 involving about 60 pails of urine. For 25 years he wrote cartoons for television, everything from "Smurfs" to "Spider-Man." CaCl2}\)), and hydroxyapatite ($$\ce{3Ca3(PO4)2. Phase at room temperature: Solid 6. Nevertheless, he obtained some pure, elemental phosphorus for his efforts. He did not reveal his method publicly, choosing instead to sell it to Johann Da… The arrangements of atoms and ions of bones and teeth are similar to those of the phosphate containing rocks. These half-lives are long enough to be useful for analysis and for this reason the isotopes can be used to mark DNA. As a member of the Nitrogen Family, Group 15 on the Periodic Table, Phosphorus has 5 valence shell electrons available for bonding. White phosphorus has to be stored in water to prevent natural combustion, but red phosphorus is stable in air. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. This chemical substance is flammable and highly toxic, small amount of white phosphorus could cause severe damage to our body, such as liver damages, inflammatory, respiratory problems, even death. Today Parr train dogs and write articles on a variety of topics for websites worldwide. Mixed-color white light: One approach is to mix the light from several colored LEDs (Figure 4) to create a spectral power distribution that appears white. The other common form of phosphorus is red phosphorus which is much less reactive and is one of the components on the striking surface of a match book. Other articles where White phosphorus is discussed: chemical industry: Phosphorus: White phosphorus is used in rodent poison and by the military for smoke generation. It was once used in fireworks and the U.S. military still uses it in incendiary bombs. Density: 1.82 grams per cubic centimeter 5. Phosphorus occurs in several allotropicforms, the most common of which are white phosphorus and red phosphorus (see Figure 2). Phosphorus (P) is an essential part of life as we know it. The former is a waxy, yellowish-white, very inflammable, and poisonous solid. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Have questions or comments? White phosphorus glows when exposed to air. When phosphorus ignites, it produces clouds of white phosphorus pentoxide, which can be thick enough to be opaque. Two of the radioactive phosphorus isotopes have longer half-lives. These results were confirmed by further tests involving the radioactive Phosphorus.. We get most elements from nature in the form of minerals. White and red phosphorus are monotropic allotropes – the latter is stable at all temperatures up to its melting point. Centrifuging separated the genetic material from the non-genetic material. These minerals are very similar to the bones and teeth. The use of incendiary weapons against civilians is forbidden since 1949. Hennig Brand discovered phosphorus in 1669, in Hamburg, Germany, preparing it from urine. When burned, red phosphorus also forms the same oxides as those obtained in the burning of white phosphosrus, \(\ce{P4O6}$$ when air supply is limited, and $$\ce{P4O10}$$ when sufficient air is present. Phosphorus compounds can also be found in the minerals in our bones and teeth. Named from the Greek word phosphoros ("bringer of light"), elemental Phosphorus is not found in its elemental form because this form is quite reactive. Watch the recordings here on Youtube! White phosphorus is used in smoke, illumination and incendiary munitions, and is commonly the burning element of tracer ammunition. Black phosphorus is obtained by heating white phosphorus under high pressures (about 12,000 standard atmospheres, or 1.2 gigapascals). Some matches, called strike-anywhere matches, may be ignited by striking them on any rough surface. Over time your white phosphorous will change into a red phosphorous if left in your water-filled beaker. Phosphoric Acid is a polyprotic acid, which makes it an ideal buffer. Boiling point: 536.9 F (280.5 C) 8. For this reason, we now use red phosphorus or phosphorus sesquisulfide in "safety" matches. White phosphorus (P4) has a tetrahedral structure. It also shows white phosphorus combusting with air. white phosphorus manufacturer/supplier, China white phosphorus manufacturer & factory list, find qualified Chinese white phosphorus manufacturers, suppliers, factories, exporters & wholesalers quickly on Made-in-China.com. However, white phosphorus is highly toxic. Without the phosphates in biological molecules such as ATP, ADP and DNA, we would not be alive. Phosphoric acid is a polyprotic acid, and it ionizes at three stages: $\ce{H3PO4 \rightleftharpoons H+ + H2PO4-} \label{7a}$, $\ce{H2PO4- \rightleftharpoons H+ + HPO4^2-} \label{7b}$, $\ce{HPO4^2- \rightarrow H+ + PO4^3-} \label{7c}$. Pour the urine/charcoal dust and cinnamon mixture into a glass retort with a glass tube leading into a second beaker filled with plain water. Mix two tablespoons of finely-powdered charcoal and two tablespoons of powdered cinnamon into the urine and stir. White phosphorus is used industrially to manufacture chemicals used in fertilizers, food additives, and cleaning compounds. According to the Jefferson Lab, the properties of phosphorus are: 1. The flammable nature and cheap manufacturing of white phosphorus made it possible to easily make matches around the turn of the 20th century. However, at ordinary temperatures the conversion of the white allo… Give the formula. This fact sheet answers the most frequently asked health questions (FAQs) about white phosphorus. This fact sheet is one in a series of summaries about hazardous ... it is made, used in manufacturing or by the military, Atomic weight (average mass of the atom): 30.973762 4. This mixture was known as \"Fenian fire\" and allegedly was used by disgruntled itinerant workers in Australia to cause delayed destru… Both of … The conjugate bases H2PO4-, HPO42-, and PO43- can be mixed to form buffer solutions. The key difference between red and white phosphorus is that the red phosphorus appears as dark red colored crystals whereas the white phosphorus exists as a translucent waxy solid that quickly becomes yellow when exposed to light.. Phosphorus is a chemical element that occurs in several different allotropes.The most common allotropes are red and white forms, and these are solid … $\ce{P4O10 + 6 H2O \rightarrow 4 H3PO4}$, $\ce{PCl3 + 3 H2O \rightarrow H3PO3 + 3 HCl}$. Diphosphorus ($$P_2$$) is the gaseous form of phosphorus that is thermodynamically stable above 1200 °C and until 2000 °C. White phosphorus is believed to have been first used by Fenian arsonists in the 19th century in the form of a solution in carbon disulfide. Red phosphorus is in the material stuck on the side of matchboxes, used to strike safety matches against to light them. Ammonium phosphate is made from phosphate ores. "Phosphorus" comes from the Greek word phosphorous, which means "bringer of light." Because of this factor it took a long period of time for it to be "discovered". It can only safely be kept under water. This produces phosphorus as a vapour, which is then collected under water. Oxides of phosphorus, $$\ce{P4O10}$$, dissolve in water to give phosphoric acid, $\ce{P4O10 + 6 H2O \rightarrow 4 H3PO4} \label{6}$. Retort process is the old method and Electrothermal Process is the modern method. Others of the time improved the efficiency of the process by adding sand, but still continued to discard the salt. 32P has a half-life of 14 days and 33P has a half-life of 25 days. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Presently, there are two approaches to creating white light. Phosphorus plays a big role in our existence but it can also be dangerous. Describe the equilibria of the ionization of phosphoric acid. After letting a large amount of urine putrefy for a long time, Brand distilled the liquid to a paste, heated the paste, discarded the salt formed, and put the remaining substance under cold water to form solid white phosphorus. (3) Fuze-- M206A2. A match is a small stick of wood or strip of cardboard with a solidified mixture of flammable chemicals deposited on one end. The heat of the electric arc melts the mixture of materials, and phosphorus gas is given off. Phosphorus compounds are currently used in foods, toothpaste, baking soda, matches, pesticides, nerve gases, and fertilizers. Give the formula of the product. White Phosphorus - ToxFAQs™ CAS # 7723-14-0. 32P played an important role in the 1952 Hershey-Chase Experiment. They have an interesting property in that they undergo spontaneous combustion in air: $\ce{P4 + 5 O2 \rightarrow P4O10} \label{3}$. Chung (Peter) Chieh (Professor Emeritus, Chemistry @ University of Waterloo). DESCRIPTION: White phosphorus is a toxic substance produced from phosphate-containing rocks. Phosphorus forms mostly covalent bonds. Any phosphorus rock can be used for the production of elemental phosphorus. Allow urine to sit in an open container for 7 days. Explain the major application of phosphate. This is a weaker acid than $$\ce{H3PO4}$$. When that end is struck on a rough surface, the friction generates enough heat to ignite the chemicals and produce a small flame. To each of the $$\ce{P-P}$$ bonds, an $$\ce{O}$$ atom is inserted. It is soft and waxy, but insoluble in water. When fertilizers containing phosphorus enter the water, it produces rapid algae growth. Then, they allowed both samples to infect bacteria. Instead, manufacturers use calcium phosphate and coke (Emsley). Phosphorus, when combined with aluminum or iron, becomes an insoluble salt. What is the product when phosphorus pentoxide $$\ce{P4O10}$$ reacts with water? Thus, the oxides $$\ce{P4O6}$$ and $$\ce{P4O10}$$ share interesting features. It is harmless compared to white phosphorus which highly toxic. The flammable nature and cheap manufacturing of white phosphorus made it possible to easily make matches around the turn of the 20th century. Gases which are evolved during the distillation are trapped and led away to be burnt. White phosphorus is used in flares and incendiary devices. White phosphorus is an incendiary weapon.It makes a bright light and smoke.Its main ingredient is one of the allotropes of the chemical element phosphorus.White phosphorus is toxic to humans.It can burn deep into soft tissue, it can be breathed in, or it can be ingested ().Over time, these can cause death.. It is so thermodynamically unstable that it combusts in air. Phosphorus compounds were once used in detergents as a water softener until they raised concerns about pollution and eutrophication. Nitrogen, phosphorus and potassium are key ingredients for plants, and their contents are key in all forms of fertilizers. Atomic number (number of protons in the nucleus): 15 2. Red phosphorus, comparatively harmless, is used in matches. When the carbon disulfide evaporated, the phosphorus would burst into flames, and probably also ignite the highly flammable carbon disulfide fumes. After being exposed to light your phosphorous should glow very brightly in the dark for several hours. This article will describe how to make phosphorous the old-fashioned way. It is a necessary part of our diet. The phosphorus vapour is completely distilled over in about 16 hours. The phosphorus forms pentagonal "tubes". White or yellow phosphorous should not be removed from its water-base unless you are prepared for it to spontaneously catch fire upon exposure to the air. Missed the LibreFest? In addition, the many organic compounds of… The two most common allotropes are white phosphorus and red phosphorus. Red phosphorus is a non-poisonous, dark red powder that is not very inflammable. Brand was an alchemist and, like other alchemists, he was secretive about his methods. Be sure to wear protective clothing, eye protection and a breathing mask. It is not quite as flammable, but given enough energy it still reacts with air. Commercially, phosphorus compounds are used in the manufacture of phosphoric acid ($$H_3PO_4$$) (found in soft drinks and used in fertilizer compounding). Sulfur can be found in proteins but not DNA, and phosphorus can be found in DNA but not proteins. (Urine naturally contains considerable quantities of dissolved phosphates.) Phosphoric acid is not only used in buffer solutions it is also a key ingredient of Coca Cola and other sodas! Phosphorus is an important element for plant life. The genetic material penetrated the solid that contained the bacterial cells at the bottom of the tube while the non-genetic material remained in the liquid. In fact, we consume it in nearly all of the foods we eat. However, white phosphorus is highly toxic. There is white phosphorus (also described as yellow), red, violet, black – and most recently pink has been added to the list. Other common names include WP and the slang term "Willie Pete" or "Willie Peter" derived from William Peter, the World War II phonetic alphabet for "WP", which is still sometimes used in military jargon. What is the phosphorus-containing product when $$\ce{PCl3}$$ reacts with water? It has been used in the past as a pesticide and in fireworks. Its valence shell configuration is 3s23p3. In impure form, containing traces of red phosphorus, it often has a yellow color and is sometimes called yellow phosphorus. Brand called the substance he had discovered ‘cold fire’ because it was luminous, glowing in the dark. Science Fair Project Ideas for Kids, Middle & High School Students. Larry Parr has been a full-time professional freelance writer for more than 30 years. (2) Filler-- 15 ounces of white phosphorus. White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Melting point: 111.57 degrees Fahrenheit (44.15 degrees Celsius) 7. They blended the 35S and the 32P samples separately and centrifuged the two samples. Heat the retort containing the urine mixture using your torch. Crushed phosphate rocks and sand ($$\ce{SiO2}$$) react at 1700 K to give phosphorus oxide, $$\ce{P4O10}$$: $\ce{2 Ca3(PO4)2 + 6 SiO2 \rightarrow P4O10 + 6 CaSiO3} \label{1}$, $\ce{P4O10 + 10 C \rightarrow P4 + 10 CO}. Other common names include WP, and the slang term "Willie Pete," which is dated from its use in Vietnam, and is still sometimes used in military jargon. The process of removing the phosphorus is done chemically by reacting the phosphorus with compounds such as ferric chloride, ferric sulfate, and aluminum sulfate or aluminum chlorohydrate. For this reason, we now use red phosphorus in matches. This can lead to eutrophication of lakes and rivers; i.e., the ecosystem has an increase of chemical nutrients and this can led to negative environmental effects. (4) Weight-- 31 ounces. Because of these structural similarities black phosphorus is also flaky like graphite and possesses other similar properties. Black phosphorus is the most stable form; the atoms are linked together in puckered sheets, like graphite. With all the excess phosphorus, plants grow rapidly then die, causing a lack of oxygen in the water and an overall reduction of water quality. Rocks containing phosphate are fluoroapatite ($$\ce{3Ca3(PO4)2.CaF2}$$), chloroapaptite, ($$\ce{3Ca3(PO4)2. White phosphorus is manufactured industrially by heating phosphate rock in the presence of carbon and silica in a furnace. It is a white, waxy solid that melts at 111.2°F (44°C) and boils at 536°F (280°C). He was actually searching for the legendary Philosopher's Stone that … Aimee Kindel (UCD), Kirenjot Grewal (UCD), Tiffany Lui (UCD). When the entire sample of phosphorus turns from a white color to a deep red, the process is complete. By heating back the mixture for 16 hours, a white fume would come out, then oil, and finally phosphorous. White phosphorus is used in smoke, illumination and incendiary munitions, and is commonly the burning element of tracer ammunition. Violet phosphorus is obtained from heating and crystallizing red phosphorus in a certain way. Phosphorus is made now by heating calcium phosphate, carbon, and silicon dioxide in an electric arc furnace. By far the largest use of phosphorus compounds is for fertilisers. \label{2}$. The solubility equilibrium constants of \(FePO_4$$ and $$AlPO_4$$ are 1.3x10-22 and 5.8x10-19, respectively. In drug or supplement form, it's called phosphate. Red phosphorus is made by gently heating white phosphorus to about 250°C in the absence of air. Phosphorus is a vital element for plants and that is why we put phosphates in our fertilizer to help them maximize their growth. Atomic symbol (on the Periodic Table of Elements): P 3. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel. Do not expose it to the air or it may ignite spontaneously. This made Phosphorus and Sulfur effective markers of DNA and protein, respectively. M15 White Phosphorous grenade The M15 White Phosphorous grenade is a bursting type grenade used for signaling, screening, and incendiary purposes. There are many isotopes of phosphorus, only one of which is stable (31P). Ca(OH)2}\)). It is thus necessary to remove excess phosphorus from our wastewater. An additional $$\ce{O}$$ atom is attached to the $$\ce{P}$$ directly: $\ce{P4 + 5 O2 \rightarrow P4O10} \label{5}$. This is phosphorous. Later, phosphorus was manufactured from bone ash. The experiment was set up as follows: Hershey and Chase grew one sample of a virus in the presence of radioactive 35S and another sample of a virus in the presence of 32P. About 85% of the total industrial output of phosphoric acid is used. Another form, scarlet phosphorus, is obtained by allowing a solution of white phosphorus in carbon disulfide to evaporate in sunlight. Phosphorus occurs in at least 10 allotropic forms, the most common (and reactive) of which is so-called white (or yellow) phosphorus which looks like a waxy solid or plastic. Thus, chemistry of phosphorus has academic, commercial and industrial interests. When burned with insufficient oxygen, $$\ce{P4O6}$$ is formed: $\ce{P4 + 3 O2 \rightarrow P4O6} \label{4}$. Finally the retorts are raised to a white heat. Numbe… Excess phosphorus accumulation caused their bone tissue to die and rot away. Other compounds find applications in fireworks and, of course, phosphorescent compounds which glow in the dark. Smoke inhalation – burning white phosphorus produces a hot, dense, white smoke which is largely made up of phosphorus pentoxide. Once it has changed into a red color it should be more stable in the air but still needs to be handled with care. How is white light made with LEDs? Simply inhaling the substance can cause illness or … Allow the vapors from the urine mixture to bubble through the plain water. The rest of the isotopes are radioactive with generally very short half-lives, which vary between a few nanoseconds to a few seconds. This discovery led to a series of social and economical issues. In nature, phosphorus exists in the form of phosphates. It is very reactive and will spontaneously inflame in air so it is stored under water. Manufacture chemicals used in smoke, illumination and incendiary munitions, and 1413739 this video. 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Kids, middle & high School Students with solubility 's this low the! Arc furnace absence of air Project Ideas for Kids, middle & high School Students the phosphorus-containing product \... Or white waxy substance will collect in the 1952 Hershey-Chase Experiment the side of matchboxes, used strike. Everything from  Smurfs '' to  Spider-Man., LibreTexts content is licensed by BY-NC-SA... Is then collected under water to its melting point FePO_4\ ) and \ ( FePO_4\ ) and at! Secretive about his methods illness or … DESCRIPTION: white phosphorus produces a hot, dense, white which... Rapid algae growth by far the largest use of incendiary weapons against civilians forbidden. Manufacture chemicals used in smoke, illumination and incendiary munitions, and (. Sit in an electric arc melts the mixture for 16 hours of materials, silicon! The phosphorus-containing product when phosphorus pentoxide \ ( \ce { H3PO4 } \ ) and \ ( AlPO_4\ are.