Given :
Concentration of hydrogen ions, [tex]H^+ = 10^{-3} \ ions[/tex].
To Find :
The pH of a solution.
Solution :
We know, pH of a solution is given by :
[tex]pH = - log [ H^+]\\\\pH = -log ( 10^{-3})\\\\pH = 3[/tex]
Therefore, the pH of the solution is 3 .