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Veronal, HC8H11N2O3, is a barbiturate drug, that is used in medicine as a long duration hypnotic and sedative. The Ka of this substance is 3.7 x 10-8. It is generally administered as the sodium salt (C8H11 N2NaO3). What is the pH of a solution of C8H11 N2NaO3 that contains 35 mg of the drug in 500 ml of solution?