SolutionHard

Question

25 mL of an aqueous solution of KCl was found to requires 20 mL of 1M AgNO3 solution when titrated using a K2CrO4 as indicator. Depression in freezing point of KCl solution with 100% ionization will be
[Kf = 2.0o mol-1 kg and molarity = molality]

Options

A.20/45
B.80/45
C.40/45
D.160/45

Solution

KCl + AgNO3 → AgCl + KNO3
0.8 × 25    1 × 20       0      0
(mili mole) (mili mole)       
    0        0      20      20   
Mole of KNO3 in solutions =
ᐃTf =  i × m × Kf
ᐃTf =  2 × × 2 =

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