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Outlines of the course of qualitative analysis followed in the Giessen laboratory / By Henry Will ; With a preface by Baron Liebig.

  • Heinrich Will
Date:
1846
Catalogue details

Licence: Public Domain Mark

Credit: Outlines of the course of qualitative analysis followed in the Giessen laboratory / By Henry Will ; With a preface by Baron Liebig. Source: Wellcome Collection.

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    ignited, yield pure metal, as a porous mass (sponge), or a bright powder. 3. SUBDIVISION. [SELENIUM, TELLURIUM.] These two bodies are volatile, and exhibit a peculiar smell when exposed to the air, somewhat resembling that of arsenic. They are easily soluble in nitric acid ; this solution contains sele- nious and tellurous acids, which, on being heated with sulphurous acid, are reduced to selenium (red) and tellurium (black). With hydrosulphuric acid insoluble precipitates are produced of sulphide of selenium (reddish-yellow), and sulphide of tellurium, (black). 4, SUBDIVISION. [TUNGSTEN, VANADIUM, MOLYBDENUM. ] The higher oxides of these three metals are easily reduced to lower ones, remaining in solution, generally with a fine blue colour, by reducing agents, tungstic and molybdic acid by metallic zinc, vanadic acid by hydrosulphuric acid. 1. SUBDIVISION. a. OXIDES OF ANTIMONY. TEROXIDE OF ANTIMONY. Sb O,. Metallic antimony is volatile, but only at an intense red heat, and in acurrent of air or gas before the blowpipe, it may easily be fused into a globule with a bright metallic surface, which by continued blowing is completely volatilised with disengagement of white inodorous fumes of teroxide of antimony. The globule is brittle, and may be powdered. By the action of nitric acid wpon antimony, according to the concentration of the acid, teroxide of antimony, or antimonic acid, or a mixture of both, is formed, insoluble in an excess of nitric acid, but soluble in tartaric acid. On fusing antimony ora compound of antimony with nitre, antimonic acid is formed ; in the case of sulphur being present in this compound, sulphuric acid at the same time is produced.
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