On precipitating antimony trichloride or tartar emetic in acid solution with sulphuretted hydrogen, an orange-red precipitate of the hydrated sulphide is obtained, which turns black on being heated to 200° C The trisulphide heated in a current of hydrogen is reduced to the metallic state; it burn
The corresponding hydroxide, orthoantimonious acid, Sb(OH) 31 can be obtained in a somewhat impure form by precipitating tartar emetic with dilute sulphuric acid; or bet::er by decomposing antimonyl tartaric acid with sulphuric acid and drying the precipitated white powder at too° C. Antimony tet
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