Answer : The pH of a solution is, 9.903
Explanation : Given,
Concentration of hydrogen ion = [tex]1.25\times 10^{-10}M[/tex]
pH : It is defined as the negative logarithm of hydrogen ion concentration.
Formula used :
[tex]pH=-\log [H^+][/tex]
Now put the value of hydrogen ion concentration in this formula, we get the pH of a solution.
[tex]pH=-\log (1.25\times 10^{-10})[/tex]
[tex]pH=9.903[/tex]
Therefore, the pH of a solution is, 9.903
