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  4. What is value of the depression of freezing point of the resulting solution if 0.1M KI and 0.2 M AgNO3 are mixed in 3: 1 volume ratio? [Kf= 1.86 K kg mol-1]

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Q. What is value of the depression of freezing point of the resulting solution if 0.1M KI and 0.2 M AgNO3 are mixed in 3 : 1 volume ratio? [Kf= 1.86 K kg mol-1]

NTA AbhyasNTA Abhyas 2020

Solution:

$\left(Kl\right)_{aq}+\left(AgNO\right)_{3 \left(aq\right)} \rightarrow \left(AgI\right)_{s}\downarrow+\left(KNO\right)_{3 \left(aq\right)}$
$Kl+AgNO_{3} \rightarrow KNO_{3}+AgI\downarrow$
Solution
Total moles of solute ions $=\left(0 .1 + 0 .2\right)\times 2\left(\because i = 2\right)$
[Solute] $=\frac{0 .6}{M}M \, \Delta T_{f}=K_{f}.\frac{0 .6}{4}=1.86\times \frac{0 .6}{4}=0.279 \, K$