Properties of Anhydrous Citric Acid

Anhydrous citric acid is easy to weather in dry air and is slightly deliquescent. It becomes soft at 75℃. Melting at 100℃. The relative density is 1.542 (-hydrate) and 1.67 (anhydrate). Easily soluble in water (monohydrate 209g] 100mL, 25°C; anhydrous 59.2g/100mL, 20°C; pH value of 1% solution is 2.31) and ethanol, soluble in ether. The natural product is found in citrus fruits such as lemons. Powder and air can form explosive mixtures. In case of open flame, high heat or contact with oxidants, there is a risk of combustion and explosion.