Answer to Question #93661 in Physical Chemistry for Raj

Question

The degree of ionisation of a 0.1M bromoacetic acid solution is 0.123. Calculate the pH of the solution and the of bromoacetic acid.

Answer 1

$\space \space \space BrCH_2COOH \to BrCH_2COO^- +H^+$

at t=0 c 0 0

at t=T $c(1-\alpha)$ $c \alpha$ $c\alpha$

Concentration of $H^+$ is given by $c \alpha$

Where $\alpha$ is the degree of ionisation.

$[H^+]=c \alpha =0.1 \times 0.123=1.23 \times 10^{-2}$ M

$pH=-log[H^+]=-log[1.23 \times 10^{-2}]=1.91$