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Calcium Bicarbonate (Ca(HCO3
Calcium Bicarbonate (Ca(HCO3)2). A salt that is relatively soluble in cold water and forms one of the principal mineral constituents of natural hard waters (q.v.). When such hard water is heated, as in a boiler, the salt decomposes to yield insoluble calcium carbonate (q.v.) as one of the end products that is deposited as a hard scale on the interior surfaces of equipment and water mains.