Q. Hydroxyl ion concentration of $10^{- 2}M\ HCl\ is$
A) $1 \times 10^{1}mol\ dm^{- 3}$
B) $1 \times 10^{- 12}\ mol\ dm^{- 3}$
C) $1 \times 10^{- 1}\ mol\ dm^{- 3}$
D) $1 \times 10^{- 14}\ mol\ dm^{- 3}$
Explanation
(b)
$\left\lbrack H^{+} \right\rbrack\left\lbrack OH^{-} \right\rbrack = 10^{- 14}$
$\left\lbrack 10^{- 2} \right\rbrack\left\lbrack OH^{-} \right\rbrack = 10^{- 14}$
$\left\lbrack OH^{-} \right\rbrack = \frac{10^{- 14}}{10^{- 2}}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 10^{- 12}\ mol\ dm^{- 3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.