Ostwald's dilution law is generally valid only when is sufficiently small. What is the standard threshold limit for above which the full quadratic equation must be solved?

Question

Ostwald's dilution law $\alpha = \sqrt{K_a/C}$ is generally valid only when $\alpha$ is sufficiently small. What is the standard threshold limit for $\alpha$ above which the full quadratic equation must be solved?

Prashant Kotian · Accepted Answer

Correct answer: B. The approximation is statistically acceptable for weak electrolytes when is 5% (0.05) or less. Above this, the exact formula is required.

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