Slide 1
Calcium usually enters the water as either calcium carbonate (CaCO. 3), in the form of limestone and chalk, or calcium sulfate (CaSO 4), which is slightly soluble in source of magnesium is dolomite (CaMg(CO 3) 2).Calcium carbonate is not soluble in water,but rain water can dissolve it because it contains a weekly acidic gas CO 2 which reacts with carbonate to .