Accumulation of lactic acid (HC₃H₅O₃), a monobasic acid in tissues leads to pain and a feeling

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6-2.Equilibrium-II (Ionic Equilibrium)

hard

Accumulation of lactic acid $(HC_3H_5O_3),$ 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, $K_a,$ for this acid will be

A

$1.4 \times 10^{-5}$

B

$1.4 \times 10^{-4}$

C

$3.7 \times 10^{-4}$

D

$2.8 \times 10^{-4}$

(NEET-2013)

Solution

Degree of dissociation, $\alpha=3.7=0.037$

$K_{a}=\alpha^{2} C=(0.037)^{2} \times 0.10$

$=1.369 \times 10^{-4} \approx 1.4 \times 10^{-4}$

Standard 11

Chemistry

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