You are asked to prepare a buffer solution with a pH of 3.50. The following solutions, all 0.100 M, are available to you: HCOOH, CH₃COOH, H₃PO₄ , NaCHOO, NaCH₃COO, and NaH₂PO₄. What would be the best combination to make the required buffer solution?
Select one:
a. NaH₂PO₄ and NaCHOO
b. H₃PO₄ and NaH₂PO₄
c. NaH₂PO₄ and HCOOH
d. CH₃COOH and NaCH₃COO
e. HCOOH and NaCHOO