Calculate either [H3O+]or [OH]for each of the solutions at 25C. Solution A: [OH]=3.29107M;[H3O+]= Solution B: [H3O+]=8.93109M;[OH]= Solution C: [H3O+]=7.15104M;[OH]= Which of these solutions are basic at 25C ? Solution B: [H3O+]=8.93109M Solution C: [H3O+]=7.15104M Solution A: [OH]=3.29107M