- Source: Calcium hydrosulfide
Calcium hydrosulfide is the chemical compound with the formula Ca(HS)2 or CaH2S2. It is formed from the reaction of calcium hydroxide or calcium carbonate with hydrogen sulfide:
Ca(OH)2 + 2H2S → Ca(HS)2 + 2H2O
CaCO3 + 2H2S → Ca(HS)2+H2O+CO2