Question

The osmotic pressure of a solution at 273 K is 2.5 atm. Its osmotic pressure at 546 K under similar conditions will be:

• A. 0.5 atm
• B. 1.0 atm
• C. 1.25 atm
• D. 1.75 atm

Answer 1

Answer: (C)

1.25 atm

According to Van't Hoff Charle's Law,

At constant pressure conditions.

$\pi$ $\alpha$ $T$

where $\pi =$Osmotic Pressure

and $T=$ Temperature

i.e. ${\pi }_1{T}_1={\pi }_2{T}_2$

$2.5\times 273={\pi }_2\times 546$

Hence, ${\pi }_2=1.25atm$