Question

What possible value of of 'I' will it have, If solute molecules undergo association in solution

Answer 1

If solute molecules undergo association then the vale of i must be less than 1 i.e(i < 1 )

Answer 2

What possible value of of 'I' will it have, If solute molecules undergo association in solution

solution : general association can be written as ..

$nA\rightleftharpoons A_n$

in this reaction, n molecules of compound A combine to form a single compound An.

Let $\alpha$ is degree of association. then,

Van't Hoff's factor, i = $1-\alpha+\frac{\alpha}{n}$

= $1-\left(\frac{n-1}{n}\right)\alpha$

hence, general value of Van't Hoff's factor for association is given by, $i=1-\left(\frac{n-1}{n}\right)\alpha$. and it is also clear that i must be less than 1.