A practical treatise on the use and application of chemical tests. With concise directions for analyzing metallic ores, earths, metals, soils, manures, and mineral waters. Illustrated by experiments / By Fredrick Accum.

  • Accum, Friedrich Christian, 1769-1838.
Date:
1820
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on the use and application of chemical tests. With concise directions for analyzing metallic ores, earths, metals, soils, manures, and mineral waters. Illustrated by experiments / By Fredrick Accum. Source: Wellcome Collection.

    531/546 (page 521)
    muth, without affecting the nitrate of lead ; lastly, that sulphate of potash decomposes nitrate of lead, and the results of that de- composition are soluble nitrate of potash, and an insoluble sulphate, containing 68.39 per cent. of lead; and it will be seen, that the analysis of the alloy of tin, bismuth, and lead, may be easily effected in the fol- lowing manner. _ First, the alloy is to be digested with an ex- cess of nitric acid with the assistance of heat, till there is no longer any metallic particle perceptible, or rather till no more gas or red. vapours are disengaged ; then the liquid is to be evaporated to dryness, and water poured repeatedly on the remaining mass to wash it. By this means, all the lead will be dissolved in the state of a nitrate, and a white residue will be obtained, containing the tin and bismuth oxidized ; then heating this residue with a fresh quantity of nitric acid, all the oxide of bismuth will be re-dis- solved; but in order to separate (without decomposing it) the portion of nitrate of