Q. A monoprotic acid in a 0.1 M solution ionisesto $0.001\%$. Its ionisation constant is
A) $1 \times 10^{- 11}$
B) $1 \times 10^{- 3}$
C) $1 \times 10^{- 6}$
D) $1 \times 10^{- 8}$
Explanation
(a)
$HA \rightleftharpoons H^{+} + A^{-}$
$K = C\alpha^{2}$
$= 0.1 \times \left( 10^{- 5} \right)^{2}$
$= 0.1 \times 10^{- 10}$ or $1 \times 10^{- 11}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.