What is the molal concentration of a sucrose (C12H22011) solution whose freezing point is -2.00 °C? The Kf for water is 1.86 °C/m.

Question

asked Oct 6, 2022 223k views

1 Answer

Arjan Kroon · Answer 1 · 2022-10-12T01:50:58+0000

Answer: The molal concentration of sucrose solution is 1.07 m

Step-by-step explanation:

Depression in freezing point is given by:

$\Delta T_f=i* K_f* m$

$\Delta T_f=T_f^0-T_f=0.00-(-2.00)^0C=2.00^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte such as sucrose)

K_f = freezing point constant =
1.86^0C/m

m= molality

Putting in the values:

2.00^0C=1* 1.86^0C/m* m

m=1.07

Thus molal concentration of sucrose solution is 1.07 m