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Solutions — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySolutions2 Marks
Question
Which method is most suitable to determine molecular mass of polymer ?
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Answer

→ Measurement of osmotic pressure provides another method of determining molar masses
of solutes. This method is widely used to determine molar masses of proteins, polymers and other marco molecules.
→ The osmotic pressure method has the advantage over other methods as pressure measurement is around the room temperature and the molarity of the solution is used instead of molality.
→ As compared to other colligative properties, its magnitude is large even for very dilute solutions. The technique of osmotic pressure for determination of molar mass of solutes is particularly useful for biomolecules as they are generally not stable at higher temperatures and polymers have poor solubility.

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