Question

Which of the following colligative properties is best suited for finding the molar mass of a substance?

• A. Relative lowering of V.P.
• B. Depression of M.P.
• C. Elevation of B.P.
• D. Osmotic presure.

Answer 1

The correct option is D

Osmotic presure.

There are various key factors favoring osmotic pressure

1) Osmotic pressure can be measured at any given temperature at which molecules are stable.

2) In order to measure $\Delta T_b$ & $\Delta T_f$, are needs to reach the B.P & M.P. This means that a part of the solvent, although small, will freeze/ boil changing the molality of remaining solution.