Sulphides of cobalt of composition C04S3, CoS, C03S4, C02S3 and CoS 2 are known. [Please select]
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All the carbonates examined (fourteen in number) dissolved with effervescence, sulphides were decomposed with evolution of sulphuretted hydrogen, and silicates with formation of gelatinous silica. [Please select]
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Sulphides may also be tested for, qualitatively, with lead acetate solution, or test-paper of sodium nitro-prusside. [Please select]
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Although, in these days of pure caustic soda, spent lyes are more free from impurities than formerly, the presence of sulphides and sulphites should be carefully avoided, if it is desired to produce good glycerine. [Please select]
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