One information is missing: the variable whose concentration is 8.3 * 10^-7 M.
There are two reasonable possibilities: 1) it is [H+] = [H3O+], or 2) it is [OH-]
So, I will do the problem with the two possibilities:
1) [H+] = [H3O+] = 8.3 * 10 ^ -7 M
=> pH = log { 1 / [H+] } = log { 1 / (8.3 * 10^-7) } = 6.08
=> pOH = 14 - 6.08 = 7.92
And the solution is acidic (pH < 7 => acid)
2) [OH-] = 8.3 * 10^ -7
=> pOH = log { 1 / [OH-] } = log { 1 / (8.3 * 10 ^ -7) } = 6.08
=> pH = 14 - 6.08 = 7.92
=> The solution is basic (pH > 7 => basic)
