Question
Question: Which of the following colligative properties can provide molar mass of proteins (or polymers or col...
Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision.
A
Relative lowering of vapour pressure
B
Elevation of boiling point
C
Depression in freezing point
D
Osmotic pressure
(5) Rast's method
Answer
Osmotic pressure
5 Rast's method
Explanation
Solution
Osmotic pressure method is especially suitable for the determination of molecular masses of
macromolecules such as protein & polymer because for these substances the value of other colligative properties such as elevation in boiling point or depression in freezing point are too small to be measured on the other hand osmotic pressure of such substances are measurable.