Question

when benzoic acid is dissolved in benzene, the osmotic pressure observed is less than the expected value. This is due to​

Answer 1

Explanation:

Benzoic acid in benzene exist as a dimer. So, number of molecules decreases and hence, osmotic pressure decreases.

Answer 2

The osmotic pressure observed is less than the expected value due to the dimerisation of benzoic acid in benzene.

- When we dissolve benzoic acid in benzene, then the molecules of benzoic acid gets associated to form a dimer.

- Due to this dimerisation, the molecular weight of benzoic acid gets doubled.

- Hence the osmotic pressure becomes almost half of the expected value.