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 . tion, he will be able to give a diagram of this second reaction ... . without troubling his reasoning powers, while at the same time he will be familiarizing himself with the more mechanical portions of a diagram. ,, In preparing large quantities of sulphurated potash, the test-tubeis replaced by an earthenware vessel termed a crucible (from crux,a cross, for originally a cross was impressed upon
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 . tion, he will be able to give a diagram of this second reaction ... . without troubling his reasoning powers, while at the same time he will be familiarizing himself with the more mechanical portions of a diagram. ,, In preparing large quantities of sulphurated potash, the test-tubeis replaced by an earthenware vessel termed a crucible (from crux,a cross, for originally a cross was impressed upon the melting-pot asused by alchemists and goldsmiths ; others derive the word from cruxan instrument of torture, the sense here being symbolical). Heating Crucibles.—Crucibles of a few ounces capacity may beheated in an ordinary grate-fire. Larger ones require a stove with agood draught—that is, a. furnace. Even the smaller ones are moreconveniently and quickly heated in a furnace. Half-ounce or one ACETATE OF POTASSIUM. 69 ounce experimental porcelain crucibles may be heated in a spirit- orgfes-flame; the air-gas flame already described being generally themost suitable. Fig. 12 Fig. Crucibles of various forms. Acetate of Potassium. Third Synthetical Reaction Place ten or twenty or more grains of carbonate of potassium in a small dish, and saturate(satur, full) with acetic acid ; that is, add acetic acid so longas effervescence is thereby produced; the resulting liquid is astrong solution of acetate of potassium. Evaporate most of the water in an open dish (See Figs. 15,16), stirring with a glass rod* to promote the evolution ofvapor ; a white salt remains, which fuses on the further appli-cation of heat; this is the official Acetate of Potassium(Potassce Acetas, B. P., and Potassii Acetas, U. S. P.). Iffused in the open vessel the acetate is liable to become slightlycharred and discolored ; this is prevented by transferring thesolid residue to a test-tube or Florence f
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