Question

100 mL aqueous solution of glucose with osmotic pressure 1.2 atm at ${25}^{o}C$ is mixed with 300 mL aqueous solution of urea at 2.4 atm at ${25}^{o}C$. Calculate the osmotic pressure of mixture.

• A. 0.68 atm
• B. 1.68 atm
• C. 3.68 atm
• D. 2.10 atm

Answer 1

Answer: (D)

2.10 atm

Use;

${\pi }_1{V}_1+{\pi }_2{V}_2={\pi }_R(V_1+V_2)$

${\pi }_R=\frac{{\pi }_1{V}_1+{\pi }_2{V}_2}{V_1+V_2}$

${\pi }_R=\frac{1.2\times 100+2.4\times 300}{400}=2.1atm$

Option D is correct.