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