Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . assium hydrate. Acids.—Spirit of nitrous ether containing so much of freeacid as to have a perceptible sour taste and an acid reactionupon blue litmus-paper, and to cause the rise of gas-bubblesfrom a few crystals of
Manual of chemical analysis as applied to the examination of medicinal chemicals : a guide for the determination of their identity and quality, and for the determination of their identity and quality, and for the detection of impurities and adulterations : for the use of pharmaceutists, physicians, druggists, and manufacturing chemists, and of pharmaceutical and medical students . assium hydrate. Acids.—Spirit of nitrous ether containing so much of freeacid as to have a perceptible sour taste and an acid reactionupon blue litmus-paper, and to cause the rise of gas-bubblesfrom a few crystals of potassium bicarbonate when droppedinto it, cannot be considered admissible for medicinal use. Ethyl chloride may be detected by burning away a smallquantity of the spirit upon a little water in a porcelain capsule,and by subsequently testing the water, after acidulation with afew drops of nitric acid, with a few drops of solution of argen-tic nitrate ; the occurrence of a white turbidity would indicatethe presence of ethyl chloride. 352 MANUAL OF CHEMICAL ANALYSIS. Methylic Alcohol.—About one ounce of the spirit is shakenwith 30 to 40 grains of anhydrous (exsiccated) potassium car-bonate ; after subsiding, the supernatant spirit is decanted ;about half a fluidounce of this dehydrated spirit is introducedinto a small flask, or a test-tube of a proper size (Fig. 90), 2^. Fig. 90. drachms of anhydrous calcium chloride in powder are added,and, after thoroughly mixing, the flask is connected with a con-denser, and is then placed in a water-bath for distillation ; thisdistillation is continued until one and a half fluid-drachm ofdistillate have been obtained. The test-tube is then removedfrom the water-bath, and, when cool, one drachm of water isadded, and the distillation once more resumed until a littlemore than half a fluid drachm of distillate is obtained. Thelatter distillate is mixed with half an ounce of water, wherein30 grains of potassium bichromate and 30 drops of conc
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Keywords: ., bookcentury1, bookdecade1870, booksubjectpharmaceuticalchemistry
