Which weak acid would be best to use when preparing a buffer solution with a pH of 9.00? an acid with Ka = 1.3 x 10^-5 an acid with Ka = 1.6 x 10^-7 an acid with Ka = 0.00016 an acid with Ka = 6.3 x 10^-11 an acid with Ka = 2.0 x 10^-6 an acid with Ka = 1.0 x 10^-9
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