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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.

    49/152 page 33
    ANTIMONY, TIN, ARSENIC. 35 of the metals, even by mercury, by sulphate of oxide of iron, by the sulphites, which render the liquid blue, and by many organic compounds, such as alcohol, ether, fats, formic acid, etc. When metallic osmium, or a platinum ore containing osmium, is heated upon the edge of a piece of platinum foil in a spirit flame, the osmic acid, which is formed, is immediately again reduced to metal and greatly increases the illuminating power of the flame. Osmium, rhodium, and palladium, are very rare metals; they are but seldom found except in ores of platinum, and then in company with iridium; it is therefore seldom necessary to search for these metals, except in the residue of platinum ores. In the state of pure salts they are easily recognised by the tests above mentioned. BEHAVIOUR OF THE METALS OF THE SECOND DIVISION. The comportment of these metals and their compounds with acids, the colour of their sulphides, etc., enable us to divide them into the following subdivisions. 1. SUBDIVISION. ANTIMONY, TIN, ARSENIC. These three metals are soluble in nitro-hydrochloric acid. Antimony and tin are converted by strong nitric acid into white oxides, which are insoluble in an excess of the acid ; arsenic dissolves in nitric acid in the form of arsenic acid. The solutions of their sulphides in sulphide of ammonium are thrown down by free acids, antimony as an orange red, tin and arsenic as yellow precipitates. 2. SUBDIVISION. PLATINUM, [IRIDIUM,] GOLD. These metals are soluble only in nitro-hydrochloric acid, and not at all affected by nitric acid. The solutions of their sulphides in sulphide of ammonium are thrown down by free acids as black or brownish precipitates. All their compounds, when : D
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