Osmolarity of 0.02 M potassium ferrocyanide solution at 300 K is (assume solute is 100% ionized)

Osmotic pressure is a colligative property, hence osmolairty is the molarity of the solution involving van't Hoff factor. K4[Fe(CN)6]⇌4K++[Fe(CN)6]4−⏟n=5i=[1+(n−1)α]=1+4α=5(α=1)Thus, osmolarity =0.02×i=0.02×5=0.10 osmol