Question

$pH$ of a $0.1$ M monobasic acid is measured to be $2$. Its osmotic pressure at a given temperature of $T$ K is:

• A. $0.1$ RT
• B. $0.11$ RT
• C. $1.1$ RT
• D. $0.01$ RT

Answer 1

The correct option is B $0.11$ RT

$HA\rightleftharpoons H^{+}+A^{-}$
A/q , $\left[HA\right]\times \alpha =\left[H^{+}\right]\Rightarrow 0.1\alpha =0.01\Rightarrow \alpha =0.1$
Now, $\pi =i\times CRT\Rightarrow \pi =1.1\times 0.1\times RT=0.11RT$