CaH2PO422H2O

Calcium dihydrogen phosphate dihydrate is an inorganic chemical compound with the formula Ca(H2PO4)2·2H2O. It is a salt formed from calcium cations and dihydrogen phosphate anions, with two molecules of water of hydration. This compound is also known by several other names, including monocalcium phosphate monohydrate, calcium phosphate monobasic, and calcium biphosphate dihydrate.

In its pure form, calcium dihydrogen phosphate dihydrate is a white crystalline solid. It is soluble in water, with its solubility increasing with temperature. The compound is an acidic salt due to the presence of the dihydrogen phosphate ion. When dissolved in water, it can undergo hydrolysis, leading to a slightly acidic solution.

Calcium dihydrogen phosphate dihydrate has various applications. It is commonly used as a leavening agent in baking, particularly in self-rising flour and baking powder, where it reacts with bicarbonate to produce carbon dioxide gas, causing doughs and batters to rise. It is also utilized as a food additive, serving as a nutrient supplement and an anticaking agent. In agriculture, it can be a component of fertilizers, providing both calcium and phosphorus to plants. Furthermore, it finds use in the production of certain animal feeds and in some dental products.