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The acid ionization constant Ka of benzoic acid (C6H5COOH; HA) is 6.5 ⨯ 10-5. (1) Calculate...

The acid ionization constant Ka of benzoic acid (C6H5COOH; HA) is 6.5 ⨯ 10-5.
(1) Calculate the pH of 2.0L of 0.20 M benzoic acid solution.
(2) After adding 8.0 g of NaOH (molar mass: 40 g/mol) to 2.0 L of a 0.20 M benzoic acid solution,
Calculate the pH.
(3) The solution (2) made above is a buffer solution. 2.0 L of 0.1 M NaOH aqueous solution was added to this solution.
After adding more, calculate the pH of the solution.

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