Is Magnesium Sulfide Soluble In Water?

Magnesium sulfide is not very soluble in water. Its solubility in water is extremely low, about 0.00021 grams per 100 milliliters of water at 25°C. As a result, it is considered practically insoluble in water. However, it can react with water to produce magnesium hydroxide and hydrogen sulfide gas. The reaction between MgS and H2O can be represented by the following equation:

MgS + 2H2O → Mg(OH)2 + H2S

This reaction is exothermic and can be dangerous if it occurs in a confined space due to the toxic nature of hydrogen sulfide gas.