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7. Determine the pH (to two decimal places) of 500 mL aqueous solution containing 0.12 mol B and 0.10 mol BH^+ according to the following reaction (at 25 degrees C): B(aq) + H2O(l) ⇌ OH^-(aq) + BH^+(aq) Kb(B) = 1.81 x 10^-6