Which weak acid would be best to use when preparing a buffer solution with a pH of 9.40?
An acid with Ka =
A) 5.0 x 10^-6
B) 6.3 x 10^-5
C) 4.2 x 10^-10
D) 6.3 x 10^-8
E) 7.9 x 10^-7
F) 2.5 x 10^-11
An acid with Ka =
A) 5.0 x 10^-6
B) 6.3 x 10^-5
C) 4.2 x 10^-10
D) 6.3 x 10^-8
E) 7.9 x 10^-7
F) 2.5 x 10^-11
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An acid with a Ka of 4.2 x 10^-10 has a pH of 9,377, so I'd assume this is the one you'd want to use.