A Manual of Metallurgy More Particularly of the Precious Metals But Including
A Manual of Metallurgy More Particularly of the Precious Metals But Including
George Hogarth Makins
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There are three oxides of bismuth. The first, or teroxide, is the base of the salts of this metal. From this an acid oxide may be prepared, sometimes called bismuthic acid ; and, lastly, these two oxides unite to form a third, but this latter may perhaps be properly regarded as a salt, wherein an equivalent of teroxide is united as base, with an equivalent of bismuthic acid, as the acid of the com- bination. The ordinary oxide of bismuth of commerce, or ter- oxide, may be prepared in the dry wa...y, by heating the subnitrate (as formed for the preparation of pure bismuth) in a porcelain crucible to a low red heat ; thus the nitric BISMUTH. 295 acid is driven off, and a yellow powder remains, which is anhydrous teroxide. In the hydrated state this oxide is a white powder, and may be obtained by the addition of ammonia in excess to a soluble salt of bismuth. The composition of the anhydrous oxide is Ei 3, and its equivalent 234. In the hydrous oxide this is in combination with one equi- valent of water.
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