10. Calcium sulfide (CaS) is insoluble in water: Why ? would positive because the ion-C ~dipole interactions are If CaS were to dissolve. 4H very weak compared to the ion-ion interactions being overcome: Salts containing Ca?* are never soluble in water: The covalent bonds in CaS would require a great deal of energy t0 overcome upon dissolving. If CaS were t0 dissolve, 4S would be negative because the possible arrangements for the water molecules would decrease: