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

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1. While calculating osmotic pressure by equation, π = CRT, the concentration is expressed in molarity but not in molality.

2. This is because the measurements of osmotic pressure are made at a certain constant temperature. 

3. Molarity depends upon temperature but molality is independent of temperature. 

4. Hence in osmotic pressure measurements, concentration is expressed in molarity.

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