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  3. Chemistry
  4. K 2 HgI 4 is 40 % ionised in its aqueous solution. The value of its van't Hoff factor is

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Q. $K _{2} HgI _{4}$ is $40 \%$ ionised in its aqueous solution. The value of its van't Hoff factor is______

Solutions

Solution:

$\alpha=\frac{ i -1}{ n'-1}$
$K _{2} Hg L _{4} \longrightarrow 2 K ^{+}+\left[ HgI _{4}\right]^{2-}$
$\therefore n'=3$
$\therefore 0.40=\frac{ i -1}{3-1}$
$\therefore i =(0.40 \times 2)+1=1.8$