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Phenobarbital, HC12H17N203, a barbiturate drug, is a nonselective central nervous system depressant used primarily as a sedative hypnotic and also as an anticonvulsant. It is generally administered as the sodium salt. What is the Ka of the acid, if a solution of NaC12H17N203 that contains 40 mg of the drug in 500 ml of solution has a pH of 9.2?

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