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 . tained in the ether, which fact will also be indicated by agreater density of the ether than that above stated. A still more accurate result of this test is obtained whenpure glycerine is employed instead of water. A
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 . tained in the ether, which fact will also be indicated by agreater density of the ether than that above stated. A still more accurate result of this test is obtained whenpure glycerine is employed instead of water. Acids,—Bhie neutral litmus-paper, when immersed inboth strata in the cylinder, should remain un-altered, as also when a small quantity of theether is evaporated in a porcelain capsule un-til reduced to a few drops, and then tested withlitmus-paper; a slight acid reaction would in-dicate acetic acid, and, in crude ether, possiblysulphurous or sulphuric acid ; the acid reactionmay also be caused by traces of ethyl sulphate;traces of this and other ethylic or amylic ethersor alcohols are also indicated when about halfan ounce of the ether is evaporated from a flatporcelain capsule by causing the fluid to flowto and fro; when the ether is evaporated, thesurfaces of the capsule should be covered witha deposit of moisture, without taste or smell, and without anyoily Fig. 41. 116 MANUAL OF CHEMICAL ANALYSIS. TABLE OF THE QUANTITY BY WEIGHT OP PURE ETHYLIO ETHER CONTAINED TN100 PARTS BY WEIGHT OF ETHER AT DIFFERENT DENSITIES. TEMPEKATtTRE ° C. o «> o « O > s-xi 100 87 74 61 99 86 73 60 98 85 72 59 97 84 71 58 96 83 70 57 95 82 69 56 94 8] 68 55 93 80 67 54 92 79 66 53 91 78 65 52
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