Solutions

\(20 \%\) of acetic acid is dissociated when its \(5 \mathrm{~g}\) is added to \(500 \mathrm{~mL}\) of water. The depression in freezing point of such water is _________ \(\times 10^{-3}{ }^{\circ} \mathrm{C}\).

Atomic mass of \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{O}\) are 12,1 and 16 a.m.u. respectively.

[Given : Molal depression constant and density of water are \(1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\) and \(1 \mathrm{~g} \mathrm{~cm}^{-3}\) respectively.]