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Answer: B. \(\alpha = \sqrt{\dfrac{K_a}{c}}\)

Answer: (b) \(\alpha = \sqrt{K_a/c}\)

Ostwald's dilution law: for a weak acid HA, \(K_a = \dfrac{\alpha^2 c}{1-\alpha} \approx \alpha^2 c\) (since \(\alpha \ll 1\)), so \(\alpha = \sqrt{K_a/c}\). The degree of dissociation increases on dilution.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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