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 . methods described on page41. Arsenious as well as arsenic acids may be detected inphosphoric acid by the two following equally accurate meth-ods: 1. A mixture of about two drachms of the officinal phosphor-ic acid wi
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 . methods described on page41. Arsenious as well as arsenic acids may be detected inphosphoric acid by the two following equally accurate meth-ods: 1. A mixture of about two drachms of the officinal phosphor-ic acid with two drachms of concentrated pure hydrochloric acidand about 20 drops of concentrated solution of stannous chloride,is heated in a test-tube; the mixture, at first white and turbid,becomes transparent and clear; a brown coloration or turbiditywill indicate arsenic. 2. Three fluid-drachms of the phosphoric acid are warmedin a test-tube; then one drop of solution of potassium per-manganate is added; if decoloration takes place, the solutionis added drop by drop until decoloration of the reagent ceases;one fluid-drachm of concentrated sulphuric acid (previouslytested for arsenic) is added, and the mixture placed in a long 100 MANUAL OF CHEMICAL ANALYSIS. test-tube (Fig. 36), care being taken that the interior upperparts of the tube remain dry; a few pieces of pure zinc are. Fig. 86. then added, and the test conducted in the mode described onpage 30. A dark coloration of the solution of argentic nitratewill confirm the presence of arsenic. ACIDA. 101 TABLE OP THE QUANTITY BT WEIGHT OF ANHYDROUS AND OF TEI-HYDEATEDPHOSPHORIC ACID CONTAINED IN 100 PARTS BY WEIGHT OF AQUEOUSPHOSPHORIC ACID AT DIFFERENT DENSITIES. Tempeeatuee ° C. Specific Percent. Percent, of Specific Percent. Percent, of Specific Percent. Percent, of Gravity. of POg. POj+SIIaO Gravity. of POe. POg+SHaO Gravity. ofPOg. POg+SHaO 68 46 63.^7 24
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