When the hydronium ion concentration equals 10 moles per liter, what is the ph of the solution? is the solution acidic or basic?

pH = - log[acid] = - log [H+]

pH = - log[10] = 1

Thus, pH is 1

if pH is 7, the solution is neutral and if pH is greater than 7 the solution is basic and if it is less than 7 the solution is acidic.

This solution have pH = 1, thus the solution is acidic.