Benzoic acid is an organic compound. Its crude sample can be purified by crystallisation from hot water. What characeteristic difference in the properties of benzoic acid and the impurity make this process of purification suitable ?

Explanation

the given information suggests that while benzoic acid dissolves in hot water, the impurities donot dissolve. The separation can be done by the process of crystallisation. For details, consult section 12.23.