5 What is the pH of a 0.20 M solution of sodium benzoate, Na(C$_6$H$_5$COO)? The $K_a$ of benzoic acid, C$_6$H$_5$COOH, is 6.5 x 10$^{-5}$. A. 5.26 B. 8.74 C. 9.09 D. 11.56
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