Magnesium Hydrogen Sulphide

Magnesium Hydrogen Sulphide is only known in aqueous solution. Since it is strongly hydrolysed the solution readily loses hydrogen sulphide, and, if it is concentrated, produces a steady stream of gas at 60° C.

Solutions have been prepared by passing hydrogen sulphide through magnesium hydroxide suspended in water, or by decomposing magnesium sulphate with barium hydrogen sulphide.

A dark yellow polysulphide solution, which is decomposed by heat into magnesium hydroxide, hydrogen sulphide, and sulphur, results when Mg(HS)₂ is digested with sulphur, or MgS with sulphur and water. A similar solution is obtained by heating magnesium chloride with polysulphides of calcium.