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The Ka of a monoprotic weak acid is 2.29 × 10-3. What is the percent ionization...

The Ka of a monoprotic weak acid is 2.29 × 10-3. What is the percent ionization of a 0.129 M solution of this acid? I got 104.8% which I know is impossible.

The Ka value for acetic acid, CH3COOH(aq), is 1.8× 10–5.

Calculate the pH of a 2.40 M acetic acid solution.

I also got these incorrect, but am not sure why and would like to understand. Please help me understand these before my upcoming test! Thanks! Calculate the pH of the resulting solution when 4.00 mL of the 2.40 M acetic acid is diluted to make a 250.0 mL solution.

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