Question

The plot of osmotic pressure (π) vs concentration (mol L⁻¹) for a solution gives a straight line with slope 25.73 L bar mol⁻¹. The temperature at which the osmotic pressure measurement is done is ______.

(Use R = 0.083 L bar mol⁻¹ K⁻¹)

Options

• 25.73°C

• 12.05°C

• 37°C

• 310°C

Answer 1

The plot of osmotic pressure (π) vs concentration (mol L⁻¹) for a solution gives a straight line with slope 25.73 L bar mol⁻¹. The temperature at which the osmotic pressure measurement is done is 37°C.

Explanation:

Given: Slope (m) = 25.73 L bar mol⁻¹

R = 0.083 L bar mol⁻¹ K⁻¹

The osmotic pressure (π) of a solution is given by the van’t Hoff equation:

π = CRT

Slope (m) = RT

T = `m/R`

= `25.73/0.083`

= 310 K

= 37°C