Question

A solution of 6g NaCl (5% by weight impurity of CaCl2) in one L of water has been prepared . Calculate the depression in freezing point. Assume complete dissociation of both . kf of water =1.86​

Answer 1

Answer:

Calculate the freezing point of a solution when given the molal freezing-point depression constant. Why salt icy roads? Salting roads lowers ...

Answer 2

Answer:

The i value for NaCl solution assuming NaCl to be 100% dissociated is 2 .

k

f

= molal freezing point constant or cryoscopic constant =1.86 K·kg/mol

∴ Depression in freezing point =i× K

f

× molality

=2×1.86×1

=3.72

T

f

=0−ΔT

f

=0−3.72=−3.72

0

C