Surface Chemistry

Surface Chemistry

Question

The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order:

  • Al3+<Ba2+<Na+

  • Na+<Ba2+<Al3+

  • Ba2+< Na2+<Al3+

  • Al3+< Na+<Ba2+

Answer

B.

Na+<Ba2+<Al3+

As2S3 is an anionic sol (negative sol) hence coagulation will depend upon coagulating power of cation, which is directly proportional to the valency of cation (Hardy-Schulze rule). 

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