The pH is calculated with the formula pH = - log [H3O+], where [H3O+] is the concentration of H3O+
=> [H3O+] = 5.6 * 10^ -7.
=> pH = - log (5.6 * 10 ^-7) = 6.25
That is a slightly acid pH, because pH is in the range 0 to 14, and 7 is neutral.
Answer: pH = 6.25
