File: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, (14590655269).jpg

Identifier: manualofchemical00hoff (find matches)
Title: 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
Year: 1873 (1870s)
Authors: Hoffmann, Fr. (Friedrich), 1832-1904
Subjects: Pharmaceutical chemistry Chemistry, Pharmaceutical
Publisher: New York : D. Appleton and Co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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^^f^^O,TCci(^i.r 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 centimetres.f
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Fio. 16. Fio. 17. * One gramme is equal to 15.4340 grains of Troy-weight. Although in this work, as previously mentioned, the time-honored apothecarysweight has been employed, for all statements of quantities by weight, as still beingin general use in pharmaceutical prtictice in the United States, Great Britain, andits colonies, yet the metric system of weights and measures has been preferred forvolumetric analysis for the above reason, and because the instruments for volume-tric analysis are generally constructed with metric divisions. It isobvious, however, that grain weights and corresponding proportionsof measures can readily be employed instead of metric units. f A cubic centimetre (Fig. 14) is the volume occupied by onegramme of distilled water at its point of greatest density, 4° C.; metricmeasurements, however, are uniformly taken at 15°.55 C. (60° F.).

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