Which of the following mixtures may be act as a buffer solution?

A) HBr, NaBr

B) HF, NaF

C) HCl, NaCl

D) HI, NaI

B) HF, NaF

Explanation:

A buffer solution is made up of a weak acid and its conjugate base. In this case, HF is a weak acid and NaF is the conjugate base, therefore the mixture of HF, and NaF would make a perfect buffer solution. The buffer would have the weak acid HF and its conjugate base, F - which comes from the soluble salt NaF.