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Van't Hoff Factor

What will be ...

Question

What will be the value of van't Hoff factor $(i)$ of benzoic acid if it demerises in aqueous solution? How will the experimental molecular weight vary as compared to the normal molecular weight?

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Solution

$i = \frac{P a r t i c l e s a f t e r a s s o c i a t i o n}{P a r t i c l e s b e f o r e a s s o c i a t i o n}$
$= \frac{1}{2} = 0.5$
van't Hoff factor $(i) = \frac{N o r m a l m o l e c u l a r w e i g h t}{E x p e r i m e n t a l m o l e c u l a r w e i g h t}$

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