Guide to a Course of Quantitative Chemical Analysis Especially of Minerals And
Guide to a Course of Quantitative Chemical Analysis Especially of Minerals And
C F Rammelsberg
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5. SULPHUR, ANTIMONY, IEON. (ANTIMONY GLANCE, GRAY ANTIMONY, BERTH IEKITE. ) The substance is oxidized in the usual way in a flask by means of nitro-hydrochloric acid, As soon as the separated sulphur appears pure, a small quantity of a solution of tarta- rie acid, and then water are added ; the sulphur is then remo- ved, the quantity of sulphuric acid determined, and the ex- cess of baryta again separated by means of sulphuric acid. The introduction of the tar taric acid is intended to prevent... the precipitation of the solution of antimony, which otherwise would take place. In this case the sulphate of baryta has to be filtered off as quickly as possible ; it is afterwards thorough- ly washed with boiling water, ignited and examined in the manner recommended, page 82. A continuous current of hydrosulphuric acid is now passed through the solution in order to throw down the antimony, until the fluid has a strong smell of the gas : the solution is then allowed to digest at a gentle heat for some time.
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