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6. Using the equilibrium approach and the Henderson-Hasselbalch approach, calculate the pH of a buffer solution that is 2.0 x 10³ mol L-1 in benzoic acid (C6H5COOH) and 1.0 x 10³

mol L-1 in sodium benzoate (C6H5COONa). For benzoic acid, K₂ = 6.3 x 105. Is the Henderson-Hasselbalch approach valid in this case? Why or why not?

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