Final answer:
The solubility of benzoic acid at 0 °C is 0.870 °C.
Step-by-step explanation:
The solubility of benzoic acid at 0 °C is 0.870 °C.
Benzoic acid is a weak acid and is only partially dissociated in water. In a saturated solution of benzoic acid at 0 °C, only about 5% of the dissolved benzoic acid molecules are dissociated to form benzoate anions and hydrated protons, while the remaining 95% exists in solution as hydrated neutral molecules.
Therefore, the solubility of benzoic acid at 0 °C refers to the concentration of the dissociated ions in the solution.