Question

The van't Hoff factor of $0.1MLa(N{O}_3{)}_3$ solution is found to be $2.74,$ the percentage dissociation of the salt is:

• A. $85\%$
• B. $58\%$
• C. $65.8\%$
• D. $56.8\%$

Answer 1

Answer: (B)

$58\%$

Formula for the relation between van't Hoff factor and percentage of dissociation is as follows.

$va{n}^{\prime }tHof{f}^{\prime }sfactor\left(i\right)=1+\frac{\alpha }{100}(n-1)$

$2.74=1+\frac{\alpha }{100}(4-1)\alpha =58$

So percentage of dissociation $=58$%.

So the answer is option B.