Question

What are the freezing point and boiling point of a solution that contains 5 g glycerol (  and 20 mL of water? 

Answer 1

Mass of glycerol = 5g

Volume of water = 20 ml

Mass of water = 20 g

Molar mass of glycerol = 92 g/ mol

For boiling point of solution

$\Delta T_b = K_bm$

$\Delta T_b = 0.512 × \frac{5}{92×20}×1000$

$\Delta T_b =1.39 K$

And for freezing point

$\Delta T_f= K_fm$

$\Delta T_f= 1.86×2.71$

$\Delta T_f= 5.05 K$