Which one of the following combinations is not a buffer solution?

Which one of the following combinations is not a buffer solution?

Which one of the following combinations is not a buffer solution?




a. NH3 / (NH4)2SO4
b. HBr / KBr
c. HCN / NaCN
d. NH3 / NH4Br
e. CH3COOH / NaCH3COO



Answer: B