Question

A solution concentration is expressed
in molarity and not in molality while
considering osmotic pressure. Why?​

Answer 1

Answer:

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Molarity is the number of moles of solute per liter of solution. ... In these situations, molality is the preferred method of expressing concentration because the mass of solute and solvent in a solution does not change.

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Answer 2

Answer:

The osmotic pressure measurements are made at a specific constant temperature. ... It is not necessary to express concentration in a temperature-independent unit like molality. Hence, the solute concentration is expressed in molarity while calculating osmotic pressure rather than molality.