Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . found to be ammoniumsalts. These, being volatile, can be got rid of towards the end ofthe operations, and thus the detection of potassium and sodium bein no way prevented—an advantage which could not be had if suchsalts as chromate of potassium or phosphate of sodium were the group-precipitants employed. Note 3.—Acetic, and not hydrochloric or nitric, acid is used indissolving the barium and calci
Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . found to be ammoniumsalts. These, being volatile, can be got rid of towards the end ofthe operations, and thus the detection of potassium and sodium bein no way prevented—an advantage which could not be had if suchsalts as chromate of potassium or phosphate of sodium were the group-precipitants employed. Note 3.—Acetic, and not hydrochloric or nitric, acid is used indissolving the barium and calcium carbonates, because chromate ofbarium, on the precipitation of which the detection of barium de-pends, is soluble in the stronger acids, and therefore could not bethrown down in their presence. ALKALI AND ALKALINE EARTH METALS. 125 TABLE OF SHORT DIRECTIONS FOR APPLYING THE FOREGOINGANALYTICAL REACTIONS TO THE ANALYSIS OF AN AQUEOUSSOLUTION OF SALTS CONTAINING ANY OR ALL OF THE ME-TALLIC ELEMENTS HITHERTO CONSIDERED. To the solution add AmCl, AmHO, Am2C03; boil and filter. PrecipitateBa , dissolve in K2Cr04, and filter. Filtrate Mg Am Na K. Add Am2HP04, shake, * It is perhaps scarcely necessary to state that this precipitate ischromate of barium (BaCr04), as any reader who has carefully gonethrough the foregoing analytical reactions will know. The occur-rence of chromate of barium at this particular place, however, andunder the circumstances described, is abundant evidence of the pre-sence of barium (in some form or other) in the liquid analyzed—which was a part of the problem to be solved by the operator. Simi-lar remarks apply, of course, to the Ca, which is finally precipitatedas oxalate (CaC204), to Mg, which is thrown out as ammonio-phos-phate (MgAmP04), to Am, Na, and K, and to the elements similarlyalluded to in the other subsequent tables for short directions foranalysis. 11* 126 THE METALLIC RADICALS, from the alkali metals, the solu
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