A solution concentration is expressed in molarity and not in mola… - Vidyadip

Question

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

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Answer

While calculating osmotic pressure by equation, π = CRT, the concentration is expressed in molarity but not in molality.
This is because the measurements of osmotic pressure are made at a certain constant temperature.
Molarity depends upon temperature but molality is independent of temperature.
Hence in osmotic pressure measurements, concentration is expressed in molarity.

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