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 . ive determina-tion of the principal constituents is required, and to which thevolumetric mode of examination is best suited, either alone oras a confirmatory test, reference has been made to these pages,in which is s
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 . ive determina-tion of the principal constituents is required, and to which thevolumetric mode of examination is best suited, either alone oras a confirmatory test, reference has been made to these pages,in which is stated the quantity of the volumetric test-solutionrequisite to produce, with a definite weiglit of the substancetinder examination, corresponding to its molecular weight, theexact reaction indicative of its officinal strength. VOLUMETRIC ANALYSIS. 51 Volumetric determinations are principally based, eitherupon Saturation^ in which the quantity of a base or anacid is measured by the quantity of acid or base which isnecessary to convert it into a neutral salt; or, upon Oxi-dation and Reduction^ in which the quantity of the substanceto be determined is found by the quantity of chlorine, iodine,or oxygen, to which it is equivalent as an oxidant, or which itrequires to pass from a lower to a higher stage of oxidation;or, upon Precipitation^ in which case the quantity of the sub-. ^^f^^O,TCci(^ Fig. 15. stance to be determined is derived from that of the reasrentrequired to separate it in an insoluble state. The quantities of the substances to be assayed volumetri-cally are submitted to examination by weight, generally coin-cident with their molecular weight, and are expressed either in 52 MANUAL OF CHEMICAL ANALYSIS. grains, or, as is now generally preferred, in grammes; * thoseof the test-solutions bv measure in cubic
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