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What is the pH of a solution containing 0.1 mole of ephedrine and 0.01mole of ephedrine HCl per liter of solution? Kb of ephedrine base

What is the pH of a solution containing 0.1 mole of ephedrine and 0.01mole of ephedrine HCl per liter of solution? Kb of ephedrine base is 2.3 x 10-5. Answer = 10.36.

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