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Nitro-Sulphuric Acid

Dissolve 1 part nitre in 9 parts sulphuric acid. This is used to separate the silver from the copper and solder of old plated goods. At about 200° Fahr. it readily dissolves silver, but scarcely acts on copper, lead, or tin, unless test. Morphia, brucia, and strychnia give it diluted, or assisted by a much higher temperature. diluted, or assisted by a much higher temperain excess. junction, which is distinctly visible when only 24000 part of nitric acid is present. When mixed with a weak solution of sulphate of indigo, and heated, the color is destroyed. of 1 equivalent of nitrogen with 1 of oxygen produces nitrous oxide, or laughing gas; with 2 oxygen, nitric oxide; with 3 oxygen, nitrous acid; with 4 oxygen, hyponitric acid; and with 5 equivalents of oxygen, nitric acid.

Pure liquid nitric acid is colorless, highly corrosive, and possesses powerful acid properties. It is employed in assaying, to dye silk and make the dilute acid measure 1 pint. The woolens yellow, and to form various salts. In medicine, it is used as a caustic, &c. The officinal strength of nitric acid of the U. S. and British pharmacopeias has a specific gravity of 1.42, and boils at 250° Fahr.