Elementary Instruction in Chemical Analysis details from sapnaonline

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844. Excerpt: ... Second Group of the Organic Acids. ACIDS, WHICH ARE UNDER NO CONDITION WHATEVER PRECIPITATED BY CHLORIDE OF CALCIUM, BUT ARE PRECIPITATED FROM THEIR NEUTRAL SOLUTIONS BY PERCHLO Ride Of Iron: Succinic acid, Benzoic acid. a. Succinic Acid. s=(C4 H2 03.) 1. Pure succinic acid is inodorous, dissolves readily in water, and volatilizes completely when heated. The officinal acid, which has an empyreumatic odour, leaves a small carbonaceous residue. The succinates are decomposed at a red heat, with the exception of succinate of ammonia; those which have an alkali or alkaline earth for their base, are converted into carbonates in this process. Most of the succinates are soluble in water; succinic acid enters into insoluble or sparingly soluble combinations only with the metallic oxides which are weak bases. 2. Perchloride of iron produces, in a solution of succinic acid brownish pale red, bulky precipitate of Persuccinate Of Iron (Fe2 03, 3s). To render this precipitation corrr?lete, the free acid must first be neutralized with ammonia, ersuccinate of iron readily dissolves in acids, and is decomposed by ammonia; the hydrated peroxide of iron separates, in this process of decomposition, and succinic acid dissolves as succinate of ammonia. 3. Acetate of lead yields with succinic acid a white precipitate of Succinate Of Lead (Pb O, s) which is soluble in succinic acid in excess, in solution of acetate oflead, and in acetic acid. 4. Protonitrate of mercury and nitrate of silver also precipitate the succinates; these precipitates, however, are 5. The alkaline succinates are insoluble in alcohol. b. Benzoic Acid. (Be=Bz 0 =CM H5 CX) 1. Pure benzoic acid appears in the form of white scales or needles, or merely as a crystalline powder. It volatilizes completely when he...