chemistry - which has the greatest buffering capacity?

Noemi Rodz

New member
a. 0.821M HF and 0.217M NaF
b. they are all buffer solutions and would all have the same capacity
c. 0.821M HF and 0.909M NaF
d. 0.100M HF and 0.217M NaF
e. 0.121M HF and 0.667M NaF

the answers is C. but why. can someone explain to me.
 
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