Question

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.

Answer 1

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