Question 13.8: Calculating Osmotic Pressure What is the osmotic pressure at...
Calculating Osmotic Pressure
What is the osmotic pressure at 25 °C of an aqueous solution that is 0.0010 M C_{12}H_{22}O_{11} (sucrose)?
Analyze
We just need to substitute the data into equation (13.4).
\pi = \frac{n}{V} R T = M \times R T (13.4)
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π = \frac{0.0010 mol \times 0.8206 atm L mol^{-1} K^{-1} \times 298 K}{1 L}
π = 0.024 atm (18 mmHg)
Assess
At a very low concentration, there is an appreciable amount of osmotic pressure. This fact is used when measuring the molar mass of polymers and biopolymers
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