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Out of BaCl2 and KCl, Which One is More Effective in Causing Coagulation of a Negatively Charged Colloidal Sol? Give Reason. - Chemistry

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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, the 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.

Concept: Properties of Colloidal Solutions
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