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Which weak acid would be best to use when preparing a buffer solution with a pH of 8

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Which weak acid would be best to use when preparing a buffer solution with a pH of 8.20? An acid with Ka = 1.0 x10^-3M An acid with Ka=1.0x1O^-6 M An acid with Ka=1.3x10^-5 M An acid with Ka = 6.6 x10^-9 M An acid with Ka = 4.0 X 10^-10 M An acid with Ka = 7.9 X 10^-5 M