Answer :
Answer: The correct answer is Option A.
Explanation:
pH is defined as negative logarithm of hydronium ion concentration. It is basically defined as the power of hydrogen ions that are present in a solution.
Mathematically,
[tex]pH=-\log[H_3O^+][/tex]
pH of the solution = 9.11
Putting values in above equation, we get:
[tex]9.11=-\log[H_3O^+][/tex]
[tex][H_3O^+]=antilog(-9.11)[/tex]
[tex][H_3O^+]=7.8\times 10^{-10}[/tex]
Hence, the correct answer is Option A.