Question

Hydroxyl ion concentration of $1M\, HCl$ is

• A. $1 \times 10^{-12}mol \,dm^{-3}$
• B. $1\times 10^{-13}mol\, dm^{-3}$
• C. $1 \times 10^{-13} mol \, dm^{-3}$
• D. $1 \times 10^1 mol \, dm^{-3}$

Answer 1

Answer: (A)

$\left[H^{+}\right] \left[OH^{-}\right]=10^{-14} $

$\left[10^{-2}\right]\left[OH^{-}\right] = 10^{-14} $

$\left[OH^{-}\right] = \frac{10^{-14}}{10^{-2}} $

$=10^{-12} \,mol \,dm^{3}$