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Fuming Nitric Acid

The red simply nitric acid loaded with nitrous or hyponitric acid. It may be thus prepared: Put solvent for gold. By the mutual action of into an iron or stoneware pot, nitre or nitrate nitric® and muriatic acids a compound of of soda, add rather more than half its weight chlorine, nitrogen, and oxygen is formed. of strong sulphuric acid, and lute on a stone- The best proportions and strength of the acids- The best proportions and strength of the acids ware head. The vapor is conducted into a series of two-necked stoneware vessels, containing each 1/6 of their capacity of water. The acid is usually obtained of the density of about 1.45. It is colored with nitrous acid gas, forming what is commonly, but improperly, termed nitrous acid. By gently heating the colored acid in a retort, the nitrous acid is driven off, and the acid remains nearly colorless, usually of the density of 1.38 to 1.42. are variously stated. Colorless nitric acid must be used. Elkington employs 21 parts of nitric acid, specific gravity 1.45; 17 parts of muriatic acid 1.15 specific gravity; and 14 parts of water. This dissolves 5 parts of gold. (See No. 3588.) According to Cooley this acid is prepared by mixing 1 part by measure nitric acid and 2 parts hydrochloric acid. The mixture should be kept in a bottle in a cold and dark place. (See No. 3193.) With a base, this compound acid forms a