25 mL of an aqueous solution of KC1 was found to require 20 mL of 1 M AgNO 3 solution when titrated using K 2 CrO 4 as an indicator. What is the depression in freezing point of KC1 solution of the given concentration? ____________ (Nearest integer).(Given : K f = 2.0 K kg mol -1 )
Assume
1) 100% ionization and
2) density of the aqueous solution as 1 g mL -1
Text Solution
Verified by Experts3
(3)
At equivalence point,
mmole of KC1 = mmole of AgNO 3
=20mmole
Volume of solution = 25 ml
Mass of solution = 25 gm
Mass of solvent
= 25-mass of solute
= 25-[20x l0 -3 x74.5]
= 23 51 em
Molality of KC1 = 
i of KC1 = 2 (100% ionisation)
T f =i x K f x m
= 2 x 2 x 0.85
= 3.4
3
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