In order to find the pH of this solution, we need to use the pH formula, which is the following:
pH = -log [H3O+]
In this formula we can see that pH is equal to the minus log of the concentration of H3O ions, now we can add the value of H3O and find the pH value:
pH = -log [H3O+]
pH = -log [1.0*10^-9]
pH = 9
Since the pH is 9, and all the pH above 7 are classified as basic, in this question, we have a Basic solution