Calcium sulfide

Cubic

Ca, S

Calcium monosulfide

Colorless to yellowish powder with odor of hydrogen sulfide

Fixed

2.8 g · cm -3

Decomposition> 2000 ° C

Poorly in water

Attention

Template: Infobox chemical / molecular formula search available

Calcium sulfide is a colorless salt consisting of the elements calcium and sulfur with the empirical formula CaS. It crystallizes in the cubic sodium chloride structure.

Production and representation

It is produced by the reduction of calcium sulfate with carbon:

And may continue to react in the reaction mixture to calcium oxide and sulfur dioxide.

Properties

Calcium sulfide is unstable and reacts in contact with water to calcium hydrosulfide (Ca ( HS ) 2), calcium hydroxide (Ca ( OH) 2) and the mixed salt of Ca ( SH ) (OH).

Lime milk Ca (OH) 2 results in cooking with elemental sulfur " lime sulfur ," which is used as an insecticide and fungicide. The active substance in it is probably calcium polysulfide, not CaS.