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10 February, 18:59

The Ka for acetic acid is 1.8 * 10-5. Which of the following statements best describes the pH of a 0.010 M solution of acetic acid?

The pH is greater than 7 but less than 12.

The pH is greater than 2 but less than 7.

The pH is greater than 0 but less than 2.

The pH is exactly 2.

The pH is exactly 7.

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  1. 10 February, 19:19
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    The pH is greater than 2 but less than 7

    Explanation:

    Acetic acid is an acid, so the pH is less than 7.

    If it were a strong acid, the pH would be 2.

    However, acetic acid is weak, so the pH is greater than 2 but less than 7 (less precisely, it's also greater than 0 but less than 7).
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