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Ethylamine (C2H5NH2) is a flammable liquid with an ammonia-like odor that is miscible with water. It is irritating to skin, mucous membranes and to the respiratory tract. If the pKa of ethylamine is 10.70, and its density is 0.689 g/ml at 15oC, explain how you would prepare 500 ml of this solution to yield a final solution with a pH of 12.0 at 15oC.