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Oxide of Bismuth
The anhy- of mercury is obtained by agitating together drous oxide is made by exposing the nitrate 1 ounce calomel with 1 gallon lime-water; dethe nitrate 1 ounce calomel with 1 gallon lime-water; deor subnitrate to gentle ignition in a crucible. canting the clear liquid after subsidence, and This is a straw-yellow colored powder. The washing the sediment with distilled water, after which it is dried on bibulous paper. powder. The washing the sediment with distilled water , hydrated oxide is a rich -looking white pow- after which it is dried on bibulous paper. der, obtained thus: Dissolve 2 pounds bis- 4144. Protonitrate of Mercury. Mix muth in 2½ pounds nitric acid, and drop it together in a wide-bottomed glass vessel, gradually into a solution of 3 pounds carbon- equal parts of quicksilver and nitric acid ate of potassa in twice it weight of water, (specific gravity 1.32); after digestion for 24 rendered caustic by previous treatment with hours in a cool place, remove the crystals that quicklime (see No. 101); wash the precipitate well with cold water .