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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