Question: what is the difference between citric acid monohydrate and anhydrous?
Answer: The anhydrous form crystallizes from hot water, while the monohydrate forms when citric acid is crystallized from cold water. The monohydrate can be converted to the anhydrous form at about 78 °C. ... On the other hand, the pH of a 1 mM solution of citric acid will be about 3.2.