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11. Benzoic acid, C7H6O2, is a weak acid with a Ka = 6.5 x 105. Calculate the pH of: a. A 0.027 M solution of

11. Benzoic acid, C7H6O2, is a weak acid with a Ka = 6.5 x 105. Calculate the pH of: a. A 0.027 M solution of benzoic acid. b. A solution of 1.62 g of solid benzoic acid dissolved in 0.25 L of distilled water.

12. Determine the pH of a 0.0071 M HNO2 solution. Ka = 4.6 x 104. (do not assume that x is small).

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