Asked by Trixie

Which of the following systems could act as a buffer?
A. HCl/Cl-
B. NaOH/OH-
C. HSO4-/SO4-2
D. H3O+/OH-
E. All of the above

my guess is C because A and B are too strong, but I am unsure of D. Can someone explain how to think through this?
Answered by DrBob222
You need a weak acid and its salt OR a weak base and its salt to have a buffer. C is the only one that is a weak acid/salt. I place D in the same class as A and B.
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