The chemical formula for phosphoric acid is H 3 PO 4. Soft drinks containing phosphoric acid, which would include Coca-Cola, are sometimes called phosphate sodas or phosphates. Orthophosphoric acid also forms esters, called organophosphates.. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Phosphoric acid forms three classes of salts corresponding to replacement of one, two, or three hydrogen atoms. This is used to denote the composition of phosphoric acid. It may be concentrated to produce commercial- or merchant-grade phosphoric acid, which contains about 54–62% P2O5 (75–85% H3PO4). Corrections? By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The molar mass of phosphoric acid is 98 g/mol. This is a crystalline solid substance with a melting point of 42.35° C. if it is used in less concentration form then it becomes transparent and viscous in nature with a density of approx. At moderate concentrations phosphoric acid solutions are irritating to the skin. Updates? Pure phosphoric acid is a crystalline solid (melting point 42.35° C, or 108.2° F); in less concentrated form it is a colourless syrupy liquid.The crude acid is prepared from phosphate rock, while acid of higher purity is made from white phosphorus.. Phosphoric acid forms three classes of salts corresponding to replacement of one, two, or three hydrogen atoms. It is used in various foods to add a sour flavor, including in some carbonated drinks. This is one of the most important and useful mineral acids which non-toxic in nature and the other name for chemical substance is orthophosphoric acid. Silica is also added, resulting in the production of calcium silicate slag. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... oxyacid: Orthophosphoric acid and phosphate salts. Nevertheless, the term "phosphoric acid" often means this specific compound; and that is the current IUPAC nomenclature. The pure compound is a colorless solid. Phosphoric acid is an inorganic or mineral acid with the chemical formula H3PO4. The chemical formula for the substance could be written as H3PO4 with a molecular weight of 97.99 g/mol. As a pH adjuster in cosmetics and skin-care products. For industrial usage, the chemical substance is prepared through a wet process where sulfuric acid is to made react with apatite ahead. Phosphoric acid is produced industrially by two general routes. Phosphoric acid is commonly encountered in chemical laboratories as an 85% aqueous solution, which is a colourless, odourless, and non-volatile syrupy liquid. The resulting phosphoric acid is then concentrated to form high-grade phosphoric acid that can be used for commercial-grade ahead. It is also known as orthophosphoric acid. Its IUPAC name is actually trihydroxidooxidophosphorus phosphoric acid, but thankfully, it is virtually never called t… The phosphoric acid from both processes may be further purified by removing compounds of arsenic and other potentially toxic impurities. It is normally encountered as a colorless syrup of 85% concentration in water. The crude acid is prepared from phosphate rock, while acid of higher purity is made from white phosphorus. The name "orthophosphoric acid" can be used to distinguish this specific acid from other "phosphoric acids", such as pyrophosphoric acid. All three hydrogens are acidic, with dissociation constants pKa1 = 2.14, pKa2 = 7.20, and pKa3 = 12.37. The term metaphosphoric acid is used also to refer to a viscous, sticky substance that is a mixture of both long chain and ring forms of (HPO3)n. The various polymeric forms of phosphoric acid are also prepared by hydration of phosphorus oxides. Phosphoric acid formula. Among the important phosphate salts are: sodium dihydrogen phosphate (NaH2PO4), used for control of hydrogen ion concentration (acidity) of solutions; disodium hydrogen phosphate (Na2HPO4), used in water treatment as a precipitant for highly charged metal cations; trisodium phosphate (Na3PO4), used in soaps and detergents; calcium dihydrogen phosphate or calcium superphosphate (Ca[H2PO4]2), a major fertilizer ingredient; calcium monohydrogen phosphate (CaHPO4), used as a conditioning agent for salts and sugars.
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