Question

0.1 M KI and 0.2 AgNO3 are mixed in 3:1 volume ratio. Find the depression in freezing point of the resulting solution. (By assuming Kf H2O=2Kkg/mol)

Answer 1

Answer:

KI(aq)+AgNO

3

(aq)+KNO

3

(aq)

KI+AgNO

3

→KNO

3

+AgI

Initial : 0.3 mole 0.2 mole - -

Final : 0.1 mole - 0.2 0.2

Total moles of solute ions =(0.1+0.2)×2(∵i=2)

[Solute] =

4

0.6

M

ΔT

f

=K

f

4

0.6

=1.86×

4

0.6

=0.279K