What is CaS? Important knowledge about CaS

1. Definition of CaS
   CaS, also known as Calcium Sulfate in English, is a colorless, odorless crystalline solid that exists in nature as a mineral. CaS has an atomic weight of 72.1428 g/mol, within the CaS molecule there is one calcium atom (Ca) and one sulfur atom (S). The ionic structure of CaS is Ca₂+ and S₂-.

2. Properties of CaS

2.1 Physical properties of CaS
CaS is a solid, colorless and odorless. The pH of CaS is quite high, due to its strong alkaline nature.

2.2 Chemical properties of CaS
CaS has the ability to react with air, acids, and water.

3. Common chemical equations of CaS

3.1 Metal reaction
CaS + 2HCl -> CaCl₂ + H₂S↑

3.2 Acid reaction
CaS + 2HNO₃ -> Ca(NO₃)₂ + H₂S↑

3.3 Non-metal reaction
CaS + O₂ -> CaSO₄

3.4 Reaction with salts
CaS + 2NaCl -> CaCl₂ + Na₂S

4. Synthesis of CaS

4.1 Laboratory synthesis of CaS
Ca + S -> CaS

4.2 Industrial synthesis of CaS
In industry, CaS is usually produced from the reaction of calcium oxide (CaO) with sulfur:
CaO + S -> CaS