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Question

Out of BaCl2 and KCl, which one is more effective in causing coagulation of a negatively charged colloidal sol? Give reason.

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Solution

According to the Hardy-Schulze rule, greater the valency of a flocculating ion the greater is its power to cause precipitation. Between Ba2+(from BaCl2) and K+ (from KCl), Ba2+ has greater valency. Therefore, BaCl2 will be more effective in causing the coagulation of a negatively charged colloidal sol.

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