Concentrated nitric acid AR 95 | Source Kingboard Chemical (certified) | Anhui nitrate AR provided by Tao Chemical Co., Ltd., Dongguan City source. Tao Chemical Co., Ltd., Dongguan City, the source (shop1413045847365.1688.com/) is specialized in the "other chemical products" of the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr Tsang. Hydrochloric acid is an important inorganic chemical raw material, widely used in dyes, pharmaceuticals, food, printing and dyeing, leather, metallurgy and other industries. Hydrochloric acid can be used in the manufacture of chloride and zinc chloride (zinc chloride is a flux) of analytically pure nitric acid, can also be used to extract ore from the radium, vanadium, tungsten, manganese and other metals to form chlorides. A variety of purposes: 1, for example hydrometallurgical metals, tungsten smelting, first scheelite (calcium tungstate mineral) mixed with sodium carbonate to produce acid calcined in air (800 ℃ ~ 900 ℃) sodium. CaWO4 + Na2CO3 = Na2WO4 + CaO + CO2 ↑ The sintered compact was immersed in water 90 ℃, so that sodium tungstate analytically pure 95 was dissolved in concentrated nitric acid, and adding hydrochloric acid, after the precipitated tungstic acid was filtered off, and then by burning, generating tungsten oxide. Na2WO4 + 2HCl = H2WO4 ↓ + 2NaCl H2WO4 = WO3 + H2O ↑ Finally, tungsten oxide in a stream of hydrogen burning nitrate analytically pure 500ml, was tungsten. WO3 + 3H2 = W + 3H2O ↑ nature with most metals (reactive than copper), and the vast majority of the metal oxide reacts corresponding sulfate and water; ion contained in correspondence with weak acid than the sulfate ions of analytically pure nitric acid salt to form the corresponding sulfates and weak acid; produces the corresponding sulfate and water and a base; can be hydrogen under certain conditions before the metal is reacted with hydrogen to form the corresponding sulfates and; catalyzes the heating conditions protein, disaccharides and polysaccharides hydrolysis; with indicator effect, so that red and purple litmus test solution, so colorless phenolphthalein test solution does not change color.