Ncert Exercises & Solutions

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

Benzoic acid can be purified by hot water because of following characteristics

(i) Benzoic acid is more soluble in hot water and less soluble in cold water.

(ii) Impurities present in benzoic acid are either insoluble in water or more soluble in water to such an extent that they remain in solution as the mother liquor upon crystallisation.

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