Answer: The pH of a solution can be calculated using the formula:
pH = -log[H+]
where [H+] is the concentration of hydrogen ions in moles per liter.
In this case, [H+] = 1.75x10^-11 M.
Therefore, the pH of the solution is:
pH = -log(1.75x10^-11)
= 10.76
So the pH of the solution is approximately 10.76.