MCQ
The method preferred for determining the molecular weight of a polymer is $.........$
- ✓Osmotic pressure
- BGas density
- CLowering of freezing point
- DDirect weighing of a single molecule
✓
Answer
Correct option: A.
Osmotic pressure
Osmotic pressure method is the best method for the determination of molecular weight of polymers and proteins, since osmotic pressure, though very small, is measurable.
On the other hand, in other colligative properties $\ce{(\triangle Tb, \triangle Tf, \triangle p/po)},$ the difference is very small and cannot be measured.
Morever, in osmotic pressure method, heating is not required. While in other methods, heating is required which changes the properties of polymers and proteins.
On the other hand, in other colligative properties $\ce{(\triangle Tb, \triangle Tf, \triangle p/po)},$ the difference is very small and cannot be measured.
Morever, in osmotic pressure method, heating is not required. While in other methods, heating is required which changes the properties of polymers and proteins.
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