Why is it essential to wash the precipitate with water before estimating it quantitatively?
Answer:
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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Why are powdered substances more effective adsorbents than their crystalline forms?