59.5g per 100mL. The solubility of citric acid monohydrate at 20℃ is 59.5g per 100mL, while the solubility at 100℃ can reach 92.5g per 100mL, which means that the solubility of citric acid monohydrate will be higher at high temperature and it can be dissolved in water more quickly. The solubility of citric acid monohydrate at 20℃ is 59.5g/ 100mL, while the solubility at 100℃ can reach 92.5g/ 100mL, which means that the solubility of citric acid monohydrate will be higher at high temperature and it can be dissolved in water more quickly.