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 . and condenses in the upper partof the tube in heavy colorless crystals or a crystalline mass. MERCURY. 201 Fig. 36. Somewhat larger quantities (in the proportion of 20 of sulphateto 16 of salt, and, vide infra, 1 of black oxide of manganese)may be sublimed in a pair of two-ounce or three-ounce round-bot-tomed gallipots, the one invertedover the other, and the joint lutedby moist fireclay (the powd
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 . and condenses in the upper partof the tube in heavy colorless crystals or a crystalline mass. MERCURY. 201 Fig. 36. Somewhat larger quantities (in the proportion of 20 of sulphateto 16 of salt, and, vide infra, 1 of black oxide of manganese)may be sublimed in a pair of two-ounce or three-ounce round-bot-tomed gallipots, the one invertedover the other, and the joint lutedby moist fireclay (the powderedclay kneaded with water to the con-sistence of dough). The lutinghaving been allowed to dry (some-what slowly, to avoid cracks), thepots are placed upright on a sand-tray (plate-shape answers verywell), sand piled round the lowerand a portion of the upper pot, andthe whole heated over a good-sizedgas flame (if an air-gas flame, itshould be an inch and a half wideand four or five inches long) for an hour or more (see fig. 36—pots raised to show joint). RedIodide of Mercury and Calomel may be sublimed in the sameway. The former requires less, the latter more, heat thancorrosive Sublimation. HSS04 + 2NaCl = = HgCl, + Na2S04 Mercuric Chloride of Morcuric Sulphate of sulphate. sodium. chloride. sodium. Note.—If the mercuric sulphate contain any mercurous sulphate,some calomel may be formed. This result will be avoided if 2 or 3per cent, of black oxide of manganese be previously mixed with theingredients, the action of which is to eliminate chlorine from theexcess of chloride of sodium used in the process, the chlorine con-verting any calomel into corrosive sublimate. Manganate of sodiumand a lower oxide of manganese are simultaneously produced. Precaution.—The operation is directed to be conducted with carein a fume-chamber or in the open air, because the vapor of corrosivesublimate, which might possibly escape, is very acrid and highlypoisonous. Its vulgar nam
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