4787. Solution of Chloride of Potash

4787.    Solution of Chloride of Potash. This solution is also known as Javellc's Bleaching Liquid ; Eau do Javelle, etc.. This is best made by passing gaseous chlorine into a solution of 1 part of carbonate of potash in 10 parts of water, until the gas ceases to be absorbed. It may also bo made by adding a solution of carbonate of potash to a solution of chloride of lime, with agitation, as long as a precipitate forms; the liquid being afterwards decanted or filtered. These processes are precisely similar to that for the soda solution, an equivalent portion of carbonate of potash being used. (See Nos. 4788 (Solution of Chloride of Soda), etc..)

4788. Solution of Chloride of Soda

4788.    Solution of Chloride of Soda. Also variously called Solution of Chlorinated Soda; Solution of Hypochlorite of Soda; Labarraque's Disinfecting Fluid; Eau de Labarraque. Take of crystallized carbonate of soda, 12 ounces avoirdupois; distilled water, 1 Imperial quart; dissolve, and pass through the solution the chlorine evolved from a mixture of common salt, 4 ounces; binoxide of manganese, 3 ounces; sulphuric acid, 21/2 fluid ounces, previously diluted with 3 fluid ounces water, heated in a retort together, and the gas purified by passing through a wash bottle containing 5 ounces water, before it enters the soda solution.

4789. Solution of Chloride of Soda

4789.     Solution of Chloride of Soda. To a solution of chloride of lime (formed of chloride of lime, 1/2 pound; water, 3 pints), add a solution of carbonate of soda (formed of carbonate of soda, crystallized, 7 ounces; water, 1 pint), and, after agitation for about 10 minutes, decart or filter, and preserve the filtrate in a well-stoppered bottle, and in a cool and dark place. This is the formula of the Dublin Pharmacopoeia, and often more convenient than the preceding one. A writer in Boettger's Notizblatt recommends that in preparing this solution from chloride of lime, bicarbonate of soda be used in place of sal-soda. There is no question but that the precipitate will bo much less bulky, and more of the liquid will be recovered in a concentrated form by decantation.

4790. Solution of Ammonio-Sul-phate of Copper

4790. Solution of Ammonio-Sul-phate of Copper. Dissolve 1 drachm of the ammonio-sulphate in 1 pint water, and filter. This is stimulant and detergent. Applied as a lotion to indolent ulcers; and, largely diluted, to remove specks on the cornea. Also used as a test for arsenical compounds, with which it throws down a green precipitate.

4791. Solution of Indigo

4791. Solution of Indigo. Place a stone-ware vessel containing 8 parts oil of vitriol in a tub of very cold water; add 1 part fine powdered indigo very gradually, to prevent the mixture from heating. The mixture should be stirred occasionally with a glass rod; and, when the solution is complete, allow it to repose for 48 hours. Then dilute with twice its weight of soft water, fielding this also very gradually, to prevent heating. This precaution is necessary to prevent partial decomposition of the indigo, which would result in the formation of sulphurous acid and indigo green. This is the sulphate of indigo or liquid blue of trade. This solution is preferably prepared by using 5 parts fuming sulphuric acid instead of the 8 parts oil of vitriol. (See No. 98 (To make Sulphate of Indigo).;