CaCl2 is an ionic substance having the chemical formula CaCl2. Calcium chloride anhydrous is another name for calcium dichloride. It is a chlorine and calcium ionic combination. It is a crystalline solid white at ambient temperature. Because it is very soluble in water, it is hygroscopic. It has no scent and a very high enthalpy change of solution. Because calcium chloride is very soluble in water, it is utilized to create solutions with relatively high densities.