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If $\alpha$ is the degree of ionization, $C$ the concentration of a weak electrolyte and $K_a$ the acid ionization constant, then the correct relationship between $\alpha, C$ and $K_{\mathrm{s}}$ is
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The correct answer is:
$\alpha=\sqrt{\frac{K_a}{C}}$
According to the Ostwald's dilution formula $\alpha^2=\frac{K(1-\alpha)}{C}$. But for weak electrolytes $\alpha$ is very small. So that $(1-\alpha)$ can be neglected. So that, $\quad \alpha=\sqrt{\frac{K_a}{C}}$
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