Question

Which has maximum osmotic pressure at temperature T K?

• A. 150 mL of 1.0 M urea solution
• B. 210 mL of 1.0 M glucose solution
• C. Mixture of 150 mL of 1.0 M urea solution and 210 mL of 1.0 M glucose solution
• D. All of the above are isotonic solutions

Answer 1

Answer: (D)

$\pi=MRT$
(a) $\pi$ (urea) = RT
(b) $\pi$ (glucose) = RT
(c) M (mixture) $= \frac{M_{1}V_{1}+M_{2}V_{2}}{V_{1}+V_{2}}$
$=\frac{150\times1+210\times1}{150+210}=1M$
$\therefore \,\pi$ (mixture) = RT
Thus, equal osmotic pressure. Thus, isotonic