Step 1:

The molality of NaCl solution is 1.32 molal.

for is 1.86 .

Freezing point is .

Where,

is the change in temperature.

is the molality depression constant.

m is the molality of NaCl solution.

i is the von t Hoff factor.

Here i =2 for NaCl, ( NaCl completely dissociates into two ion).

Since 1 mole of NaCl gives two moles of ions (1 mole of  and 1 mole of ).

Substitute all values in the freezing point.

New freezing point of NaCl solution is .

Solution :

The freezing point of NaCl solution is .