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A solution contains 0.03 M phenobarbital and 0.02 M sodium phenobarbital. Calculate the pH of this...

A solution contains 0.03 M phenobarbital and 0.02 M sodium phenobarbital. Calculate the pH of this buffer solution. The pKa for phenobarbital is 7.4. What is the percent of phenobarbital (in the free acid form) in the solution? Ans: 60.2%           

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