4778. Standard Solution of Chloride of Calcium

4778.    Standard Solution of Chloride of Calcium. Dissolve carefully 2 grains pure carbonate of lime in a little pure hydrochloric acid; evaporate the solution to dryness, and dissolve the residuum in 1 pint pure water. This forms the standard solution of

16° of hardness. 1 measure of this solution mixed with 15 of water constitutes a solution of 1° of hardness; 2 measures of it with 14 of water make a solution of 2° of hardness etc.. This solution is the standard used in testing the hardness of water.

4779. Solution of Iodide of Potassium

4779.     Solution of Iodide of Potassium. Dissolve 10 grains iodide of potassium and 5 grains iodine in 1 pint water. Dose, 2 to 6 grains in the usual case where iodine is employed.

4780. Solution of Chloride of Calcium

4780.      Solution of Chloride of Calcium. Dissolve 4 ounces fused (or 8 ounces crystallized) chloride of calcium, in 12 ounces water, and filter. Dose from 10 drops to 2 drachms, for scrofulous tumors, etc.; also used as a test for sulphuric acid, in contact with which it throws down a white precipitate insoluble in nitric acid.

4781. Solution of Sulphate of Morphia

4781.    Solution of Sulphate of Morphia. Dissolve 16 grains sulphate of morphia in 4 drops dilute sulphuric acid, 1 fluid ounce water, and 1 fluid drachm rectified spirit. Dose, 5 to 10 drops.

4782. Solution of Nitrate of Baryta

4782.    Solution of Nitrate of Baryta. Dissolve 4 grains nitrate of baryta in 80 grains water. This is used in the same manner as chloride of barium (see No. 4774 (Solution of Chloride of Barium)) for testing sulphuric acid, with the same results.

4783. Solution of Nitrate of Silver

4783.    Solution of Nitrate of Silver. Dissolve 1 drachm crystals of nitrate of silver in 1 fluid ounce distilled water. It must be protected from the action of light. This is employed as a test for soluble chlorides, any of which, slightly acidulated with nitric acid, will give a white, curdy precipitate (chloride of silver) when brought in contact with diluted nitrate of silver.

4784. Liquor of Potassa; Solution of Potash; Soft-Soap Lye

4784.    Liquor of Potassa; Solution of Potash; Soft-Soap Lye. Take 1 gallon boiling distilled water; use sufficient of this to slack 8 ounces recently burnt lime in an earthen vessel; in the remainder of the water dissolve 15 ounces carbonate of potassa, and add the slacked lime. Cork the mixture closely in a vessel, and shake it frequently until cold, then allow it to settle and decant the clear liquid into clean, well-stoppered green-glass bottles. Liquor of potassa is antacid, diuretic, and resolvent. In indigestion, acid eructations, heartburn, etc., it may be taken with great benefit. It neutralizes the acid, and counteracts the morbid tendency of the stomach to acid secretion. Dose, 10 drops, gradually increased to 40. It is powerfully poisonous, and should be greatly diluted in anything not acidulous. When pure, it does not effervesce with acids, nor give a precipitate with lime-water, or with a solution of oxalate of ammonia. (See No. 101 (To make Caustic Potash)).