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Which of the following electrolytes is the most effective for coagulating ferric hydroxide sol?

1. KCl
2. KNO3
3. K2SO4
4. K3[Fe(CN)6]

Correct answer: K3[Fe(CN)6]

Solution

Ferric hydroxide sol is positively charged, so the most effective coagulant has the most highly charged anion. K3[Fe(CN)6] supplies [Fe(CN)6]^3-, a trivalent anion, making it the most effective coagulant by the Hardy-Schulze rule.

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