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The scientist van’t Hoff introduced a factor ( ) to account for the extent of association or…
The scientist van’t Hoff introduced a factor ($i$) to account for the extent of association or dissociation of solutes. It is mathematically expressed as:
$i = \frac{\text{normal molecular mass}}{\text{experimental molecular mass}}$
In case of association, $i < 1$ and in case of dissociation $i > 1$.
(i)[1.5]
In the calculation of molecular mass of $\text{K}_4[\text{Fe}(\text{CN})_6]$ by using a colligative property, what will be the value of van’t Hoff factor if the solute is $25\%$ dissociated?
(ii)[1.5]
Find the value of van’t Hoff factor for a dilute aqueous solution of benzoic acid in water when it is completely associated to form a dimer.
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From ISC 2025 Chemistry Paper 1, question 13.