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Oxysulphides of Calcium

A mixture of calcium hydroxide and sulphide, regarded by Folkard as a molecular compound, 4Ca(OH)2.3H2S, is obtained by passing a dry mixture of hydrogen and sulphuretted hydrogen over calcium hydroxide. At 100° C. the composition may be expressed by the formula 2Ca(OH)2.2Ca(OH)(SH), and at red heat in an inert gas, 2CaO.2CaS.H2O. By further heating, calcium sulphate may be obtained. Orange-yellow prismatic crystals, to which several different formulae have been ascribed, CaO.CaS2.7H2O, 3CaO.CaS4.12H2O, 2CaO.CaS3.10 or 11H2O, CaS3.3CaO.14 or 15H2O, CaS4.4CaO.18H2O, and CaS5.5CaO.20H2O, can be obtained by boiling together calcium hydroxide, sulphur, and water, by treating a fused mixture of lime and sulphur with hydrochloric or acetic acid, or by evaporating a solution of the hydrosulphide. The crystals are monoclinic, gradually become colourless on exposure to air, and are decomposed by water but not by alcohol.

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