40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After...

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40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After...

40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution? [Ka(CH₃COOH) = 1.8 × 10^–5]

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