In
case of association, value of i is less than unity while for dissociation it
is greater than unity For example, the value of i for aqueous KCl
solution is close to 2, while the value for ethanoic acid in benzene is
nearly 0 5 Inclusion of van’t Hoff factor modifies the equations for colligative
properties as follows:
Relative lowering of vapour pressure of solvent,
1o
1
2
o
1
1
 – 
 
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