An Elementary Course in Inorganic Pharmaceutical and Medical Chemistry; Designed Especially for Students of Pharmacy and Medicine - Softcover
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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1894. Not illustrated. Excerpt: ... acid the sulphate is formed with the liberation of oxygen: 2MnO, + 2H,SO4 = 2MnSO4 -f 2H,O + O,. This salt occurs in colorless or pale rose-colored transparent prisms which are somewhat efflorescent in dry air, very soluble and of a bitter and astringent taste. The aqueous solution of the salt yields with ammoniumsulphide test-solution a flesh-colored precipitate, soluble in dilute acids. If a little of the dry salt is mixed with a little sodium hydroxide and the mixture fused, it will yield a dark green mass which dissolves in water with a green color. The Arsenic Salts. Occurrence.--The element arsenic is sometimes found in a native state, but the largest proportion is derived from the sulphides, realgar, As,S,, and orpiment, As,S,, and from the arsenical iron ores, the latter consisting chiefly of FeAs,, NiAs, and Co As,. Mispickel, Fe,S,As, is also a source, and arsenous acid, As,O,, is found in nature as the mineral arsenolite. There are many other forms of occurrence, but they are not utilized much as sources of the element. Preparation.--The ores, preferably the arsenical iron ores, are roasted in a reverberatory furnace and the volatile product, crude arsenous oxide, As,O,, condensed in long and nearly horizontal chimneys, or in a series of chambers made of brick. The arsenic volatilizes and unites with oxygen, becoming the arsenous oxide, As4 + 3O, = 2As,O,, which condenses and forms the crude oxide which is purified by resublimation. The purified As,O, is then heated in retorts with charcoal, which unites with the oxygen, leaving the arsenic in the elementary state as a sublimate: 2As,O, + 3C, = As4 + 6CO (or 3CO,). Properties, Physical and Chemical.--Arsenic is a steelgray, crystalline solid, having a lustre, and a specific gravity ranging from 5.70 t...
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