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Solution of Citrate of Potassa

acid; after effervescence has ceased, gradually introduce 1½ fluid ounces distilled water; add to this slowly, and with constant stirring, a solution of 600 grains citrate of potassa in 2 pints distilled water. Nitrate of potassa and citrate of bismuth are formed; the latter, being Take of citric acid, & ounce, troy; bicarbonate insoluble, is precipitated, and, being thoroughof potassa, 330 grains; water, pint. Dis- ly washed with distilled water, may be dried solve the acid and bicarbonate in the water, on bibulous paper with a gentle heat. and strain the solution through muslin. (U. S. 4814. Solution of Citrate of Bismuth Ph.) and Ammonia. Rub some citrate of bis- 4809. Effervescing Citrate of Mag-muth with sufficient distilled water to reduce nesia. Take of citric acid, dried and pow- it to a uniform pasty consistence, and add dered, 7 parts; heavy carbonate of magnesia, cautiously, with constant trituration, strong 5 parts; mix, and preserve in well-corked water of ammonia until a solution is obtained, bottles. 4810. Effervescing Citrate of Magnesia. Take of powdered citric acid, 2½ ounces; powdered sugar, 8 ounces; mix and triturate to a fine powder, and drive off the water of crystallization by the heat of a water-bath. Add citrate of magnesia (prepared by fusion), 4 ounces; oil of lemon, 10 drops; and mix immediately; then add bicarbonate of soda, 3 ounces; and again trituobserving to avoid an excess of ammonia. Filter the liquid through paper, returning the first portions that pass, should they be turbid.