Question

Why is it important to wash a precipitate with water before estimating it quantitatively?

Answer 1

Explanation:

When a substance gets precipitated, some ions that combine to form the precipitate get adsorbed on the surface of the precipitate. Therefore, it becomes important to wash the precipitate before estimating it quantitatively in order to remove these adsorbed ions or other such impurities.

Answer 2

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When a colloidal solution is prepared, quite often it contains certain impurities of electrolytes which are crystalloidal in nature and tend to destabilize the solution. Hence it is essential to wash the precipitate with water before estimating it quantitatively to remove impurities of electrolytes.

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