This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 Excerpt: ... the filtered solution is mixed with a solution of pure potassic carbonate, which causes ferrous carbonate (COFeo") to precipitate, while potassic iodide remains in solution: --Fel2 + COKo2 = 2KI + COFeo'. Ferrous Potassic Potassic Ferrous iodide. carbonate. iodide. carbonate. The solution is filtered to separate the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1870 Excerpt: ... the filtered solution is mixed with a solution of pure potassic carbonate, which causes ferrous carbonate (COFeo") to precipitate, while potassic iodide remains in solution: --Fel2 + COKo2 = 2KI + COFeo'. Ferrous Potassic Potassic Ferrous iodide. carbonate. iodide. carbonate. The solution is filtered to separate the suspended precipitate, and evaporated till the salt crystallizes on cooling. Potassic iodide crystallizes in cubes, and is very soluble in water: it is also soluble in alcohol. Its solution dissolves iodine, forming a deep brown liquid. It is used in photography and in medicine. Tests for Potassium Compounds.--If tartaric acid be added to a solution of a potassium salt in a test-tube, N Platinic chloride (PtCl4) gives in solutions of potassium salts, to which a little hydrochloric acid has been added, a yellow crystalline precipitate after agitation, which is a molecular combination of potassic chloride and platinic chloride (2KCl, PtCl1). Compounds of potassium, when introduced on a loop of platinum wire into the Bunsen or blowpipe flame, tinge it of a purple or violet colour; and if the flame be examined by the spectroscope, the spectrum will be found to consist of three bright lines, two in the red portion and one in the violet. Sodium--Na Atomic weight, 23. Molecular weight (probable), 46. Atomicity, I. Sp. gr., 097. Special Notice.--Sodium was discovered by Sir Humphry Davy in 1807, immediately after he discovered potassium. He obtained it from moist sodic hydrate (NaHo), by the same process as that by which he obtained potassium from potassic hydrate. Occurrence inNature.--Sodium occurs in nature as sodic chloride (NaCl), which in the solid form is known as rock or common salt; and in solution it occurs in sea water. It also occurs as ...
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