Question

A 0.01 M ammonia solution is 5 % ionized, the concentration of $O{H}^{-}$ ions is:

• A. 0.005M
• B. 0.0001 M
• C. 0.0005 M
• D. 0.05 M

Answer 1

The correct option is C 0.0005 M

The concentration is 0.01 M and the percentage of ionization is 5%.
The expression for the hydroxide ion concentration is,
$\left[O{H}^{-}\right]=C\alpha =C\times \frac{percentage}{100}=0.01\times \frac{5}{100}=0.0005M$.