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Theoretically, which ph for the ch3coona/ch3cooh buffer should display the smallest change in ph? Which pH...

Theoretically, which ph for the ch3coona/ch3cooh buffer should display the smallest change in ph? Which pH buffer for the tris/tris hydrocloride? Why?

Options:

ch3coona/ch3cooh pKa=4.75

- pH=5.80, pH=4.75 or   pH=3.50

tris/tris hydrocloride pKa=8.08

- pH=9.00, pH=8.08 or pH=6.60

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