Question

If 0.5 m solution of $Ca(NO_3)_2$ and 0.75 m solution of KOH is taken, then the depression in freezing point is

• A. greater in $Ca(NO_3)_2$ because number of ions are greater
• B. greater in KOH because concentration is high
• C. equal in both and freezing point is less than $0^{\circ}C$ because ionic concentration is same
• D. equal to $0^{\circ}C$ in both because ionic concentration is negligible.

Answer 1

Answer: (C)

equal in both and freezing point is less than $0^{\circ}C$ because ionic concentration is same

Answer 2

Ionic concentration of $Ca(NO_3)_2 =$ Ionic concentration of $KOH = 0.75 ? 2 = 1.50$ Ionic concentration is same so depression in freezing point will also be same.