Question

Arrange the following solutions as directed: 

0.1 M urea, 0.001 M sucrose, 1 M glucose (in the order of increasing osmotic pressure)

Explain the reason for your answers also.

Answer 1

0.001 M sucrose < 0.1 M urea < 1 M glucose

Reason:

Osmotic pressure depends on the concentration of solute particles. Since all are non-electrolytes (no dissociation), the solution with the lowest molarity has the lowest osmotic pressure, and the one with the highest molarity has the highest osmotic pressure.