A Manual of Chemistry, Descriptive And Theoretical, Part 1
A Manual of Chemistry, Descriptive And Theoretical, Part 1
William Odling
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The resulting liquid has a specific gravity of i'04. It is colourless, has the smell of burning sulphur, and reacts strongly acid to test paper. When boiled, it gives ofiF sulphurous acid or anhydride, but very prolonged ebullition is required to drive ofif the whole of the gas. By ex- posure to air, the solution slowly oxidises into sulphuric acid. When mixed with chlorhydric acid and metallic zinc or stannous chloride, it is reduced to the state of sulphydric acid, which in the case of the zi...nc may be recognised by its reaction on lead-paper. With stannous chloride we obtain a precipitate of brown sulphide of tin. Both sulphurous anhydride and acid act as powerful reducing agents. They liberate iodine from iodic acid, and, in the presence of water, finally convert it into iodhydric acid. Sulphurous acid Digitized by VjOOQIC SULPHITES. 167 and iodine, in presence of a large quantity of water, yield iodhy- dric and sulphuric acids: H^SO^ + I* + H^ = 2HI + H^S04, Bunsen's method of volumetric analysis is based upon this reac- tion.
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