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

To answer the question regarding the purification of benzoic acid from its crude sample using crystallization from hot water, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Benzoic Acid**:
- Benzoic acid is an organic compound with the formula C7H6O2. It is known for its ability to form crystals and is often used in various applications, including food preservation.

2. **Crude Sample**:
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