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  4. In a solvent 50 % of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is × 10-2.

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Q. In a solvent $50 \%$ of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is ___$\times 10^{-2}$.

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Solution:

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Now, $i=\frac{\text { final moles }}{\text { initial moles }}=\frac{0.25 a+0.5 a+0.5 a}{0.5 a+0.5 a}$
$=1.25=125 \times 10^{-2}$