Question

If pH of a solution is 5 then it indicates that concentration of $\left[O{H}^{-}\right]$ ions are

• A. ${10}^{-5}mol/liter$
• B. ${10}^{-7}mol/liter$
• C. ${10}^{-9}mol/liter$
• D. ${10}^{-1}mol/liter$

Answer 1

The correct option is C ${10}^{-9}mol/liter$

Since pH = 5

This indicates, concentration of hydrogen ions = ${10}^{-5}$ mol/liter

$\therefore$ The concentration of $\left[O{H}^{-}\right]$ ions = ${10}^{-9}$ mol/liter