Why is it essential to wash the precipitate with water before estimating it quantitatively?

Explanation

To answer the question of why it is essential to wash the precipitate with water before estimating it quantitatively, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Precipitation**:
- When a precipitate forms, it is often the result of a chemical reaction where two soluble substances react to produce an insoluble compound. This compound settles out of the solution as a solid.

2. **Presence of Impurities**:
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