A colloid is prepared by adding KI solution to excess AgNO3 solution and is then purified by dialysis. Find the minimum mass (in grams) of electrolyte AB (molar mass = 60 g/mol) required to completely coagulate 1 L of this colloid. Active ion causing flocculation | Flocculation value (mmol

Question

A colloid is prepared by adding KI solution to excess AgNO3 solution and is then purified by dialysis. Find the minimum mass (in grams) of electrolyte AB (molar mass = 60 g/mol) required to completely coagulate 1 L of this colloid. Active ion causing flocculation | Flocculation value (mmol/L) A+ | 50 B- | 100

Accepted Answer

6. AgI sol formed in excess Ag+ carries positive charge; it is coagulated by the anion B- (flocculation value = 100 mmol/L). Moles of AB needed per litre = 100 mmol = 0.1 mol. Mass = 0.1 mol * 60 g/mol = 6 g.

Solution

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