chemistry

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Which weak acid would be best to use when preparing a buffer solution with a pH of 8.50?
1) an acid with Ka=3.3x10^-9
2) an acid with Ka=5.0x10^-4
3) an acid with KA=6.3x10^-6
4) an acid with Ka=5.0x10^-7
5) an acid with Ka=4.0x10^-5
6) an acid with Ka=2.0x10^-10

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