Which of the following weak acids would be the best choice if you wanted to make...

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Question

Which of the following weak acids would be the best choice if you wanted to make a buffered solution at a pH = 9.0?

a) HSO₄^- : Ka= 1.0 x 10^-2

b) HF : Ka = 6.9 x 10^-4

c) HCN : Ka = 5.8 x 10^-10

d) HPO₄^2- : Ka = 4.5 x 10^-13

science chemistry

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