Merck, C1909-500G, Citric acid monohydrate

Citric acid monohydrate is an organic acid. Its molar enthalpy of solution in water has been reported to be ΔₛₒₗHm (298.15K, m = 0.0203molkg⁻¹) = (29061±123)Jmol⁻¹. It can be produced by crystallization from mother liquor of citric acid solution at 20-25°C during citric acid synthesis. An investigation of its crystal growth kinetics indicates that growth is linearly dependent on size. Citric acid monohydrate is an organic weak acid used as a natural preservative in food and beverage products.