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Solution of Nitrate of Silver

pered), and kept in a cool and dark place.

Dissolve 1 drachm crystals of nitrate of silver Nothing metallic should be allowed to come in 1 fluid ounce distilled water. It must be in contact with it. (See No. 104.) A better protected from the action of light. This is plan of filtering the above is as follows: The employed as a test for soluble chlorides, any neck of the funnel should be choked with of which, slightly acidulated with nitric acid, some fragments of broken glass, over which vill give a white, curdy precipitate (chloride a layer of smaller ones should be placed, and, of silver) when brought in contact with dilu- over all, a thick layer of coarsely powdered ted nitrate of silver. glass. This is all the filtration necessary, and is much superior to that ordered in the Phar- should be stirred occasionally with a glass macopeia, as the contact with the muslin, rod; and, when the solution is complete, and the longer exposure, weaken the solution. allow it to repose for 48 hours. Then dilute The U. S. Pharmacopoeia directs the solution with twice its weight of soft water, adding of chloride of lime to be prepared by mixing this also very gradually, to prevent heating. 12 troy ounces muriatic acid with 1/2 pint dis- This precaution is necessary to prevent partial tilled water; gradually adding 6 troy ounces decomposition of the indigo, which would marble in small pieces. Towards the close of result in the formation of sulphurous acid the effervesence, apply a gentle heat, and, and indigo green. This is the sulphate of when the action has ceased, pour off the indigo or liquid blue of trade. This solution clear liquid, and evaporate to dryness. Dis- is preferably prepared by using 5 parts fuming solve the residue in 14 times its weight of sulphuric acid instead of the 8 parts oil of distilled water, and filter through paper. vitriol. (See No. 98.) 4792. Solution of Carbonate of Ammonia. This is prepared by dissolving 1