Question

The relationship between the value of Osmotic pressure $\left(\pi \right)$ of the solution obtained by dissolving 6g.L${}^{-1}$ of acetic acid $\left({\pi }_1\right)$ and 7.45 g.L${}^{-1}$ of KCl $\left({\pi }_2\right)$ is :

• A. ${\pi }_1<{\pi }_2$
• B. ${\pi }_1>{\pi }_2$
• C. ${\pi }_1={\pi }_2$
• D. $\frac{{\pi }_1}{{\pi }_1+{\pi }_2}=\frac{{\pi }_2}{{\pi }_1+{\pi }_2}$

Answer 1

Answer: (A)

${\pi }_1<{\pi }_2$

$6g/c$ acetic acid

Molar man of $C{H}_{3}COOH=60$

Concentration $=\frac{6}{60}=0.1mol/L$

$7.45g/LKClMolarman=$

concentration $=\frac{7.45}{74.5}=0.1mol/L$

$1)$

Acetic acid dimerse so $1=0.5$

$x_1=iCRT$

$x_2=0.5CRT$

$2)KCl$ brealcs in aqueous solution $i22$

$x_2=2CRT$

$C15$ same for both so $x_2>x_1$