Benzoic acid, HC7H502, and its salts are used as food preservatives. Ka for benzoic acid is 6.3×10-5. A solution benzoate, NaC7H5O2, in water has a concentration of 0.015mol.dm3 A) what is the equilibrium concentration of benzoic acid in the sodium benzoate solution? B) what is the pH of this solution

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