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What mass (in grams) of sodium benzoate must be added to 150.0 mL of a 0.14...

What mass (in grams) of sodium benzoate must be added to 150.0 mL of a 0.14 M benzoic acid solution in order to obtain a buffer with a pH of 4.25? The molecular weight of sodium benzoate is 144.11g/mol. The Ka of benzoic acid is 6.46x10^-5. Be sure to include proper units in your answer to two significant figures.

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