. Essentials of medical and clinical chemistry. With laboratory exercises . 2HP04—are useful saline purgatives ; andSodium Sulphite—Na2S03—is used in preventing fermentation and as a reducing agent in photography. Tests.—No good precipitant; for all the compounds of sodium are soluble. However, the strong yellow color it gives a flame is a very delicate test; in fact, often annoyingly delicate, for it shows traces of sodium in almost everything. POTASSIUM occurs only in compounds. Prepared by heating one of its oxygen compounds with charcoal in an iron retort (K2C03 + 2C = 3CO + K2). The metal
. Essentials of medical and clinical chemistry. With laboratory exercises . 2HP04—are useful saline purgatives ; andSodium Sulphite—Na2S03—is used in preventing fermentation and as a reducing agent in photography. Tests.—No good precipitant; for all the compounds of sodium are soluble. However, the strong yellow color it gives a flame is a very delicate test; in fact, often annoyingly delicate, for it shows traces of sodium in almost everything. POTASSIUM occurs only in compounds. Prepared by heating one of its oxygen compounds with charcoal in an iron retort (K2C03 + 2C = 3CO + K2). The metallic K distills over and is condensed in a flat receiver. Physical Properties.—Soft as wax ; lighter than water ; silvery lustre when freshly cut, but quickly tarnishes. PART I.—INORGANIC CHEMISTRY. 91 Chemical Properties.—Intensely electro-positive ; hence it pos-sesses great affinity for the non-metals;149 takes O from H20,150even as ice,51 setting fire to the escaping H, and giving the flamethe violet color characteristic of K (Fig. 38). Fig. 37. Fig.
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