Which of the following combinations would act as buffered solutions?
a. HCl and NaCl
b. CH_3COOH and KCH_3COO
c. H_2S and NaHS
d. H_2S and Na_2S
none really... The acid needs to be weak and the base strong though.
The Attempt at a Solution
HCl is one of the strongest acid, so that eliminates a. Since the conjugate base of H_2S should be HS^-, that also eliminates d., which has somehow gotten rid of the other H as well. However, I'm having a difficulty choosing between b and c because CH_3COOH and H_2S are both weak acids (from what I've learnt), which makes them good candidates for a buffered solution.