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Why is it essential to wash the precipit...

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

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Some amount of the lectrolyte are mixed to form the ppt. some of these electrolytes remains adsorbed on the surface of the particles of the ppt. hence, it is essential to wash the ppt with water to remove the sticking electrolytes (or any other impurities) before estimating it quantitatively.
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NCERT-SURFACE CHEMISTRY-Exercise
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  2. What modification can you suggest in the Hardy Schulze law?

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