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Calcium citrate is also named Tricalcium citrate, the molecular formula: Ca3(C6H5O7)2.4H2O; the molecular weight: 570.50,CAS NO. is 813-94-5. It is a kind of additive ratified by US FDA. The character: White powder, no odor, a little hygroscopic, unsolvable in water (0.095g/100ml,25 ). Hardly soluble in ethanol (0.0089g/100ml, 25 ). The crystalline: the crystal water will be lost gradually when be het up to 100 , lost completely up to 120 .