Accumulation of lactic acid (HC_3 H_5 O_3) , a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7 \% dissociates. The value of dissociation constant, K_a

Correct answer: B. 1.4 × 10^ -4 α=(3.7)/(100)= 0.037 According to Ostwald's formula aligned K_α& =α^2 C & =(0.037)^2 ×0.10 & =1.369 ×10^ -4 aligned

NEET 2013

NEET 2013 · Chemistry · Ionic Equilibrium

Accumulation of lactic acid (HC_3 H_5 O_3) , a monobasic acid in...

Accumulation of lactic acid

\left(\mathrm{HC}_3 \mathrm{H}_5 \mathrm{O}_3\right)

, a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10

\mathrm{M}

aqueous solution, lactic acid is

3.7 \%

dissociates. The value of dissociation constant,

\mathrm{K}_a

, for this acid will be:

B. $1.4 \times 10^{-4}$

\alpha=\frac{3.7}{100}=

0.037 According to Ostwald's formula

\begin{aligned}\mathrm{K}_\alpha& =\alpha^2 \mathrm{C}\\ & =(0.037)^2 \times0.10 \\ & =1.369 \times10^{-4} \end{aligned}