Which one of the following mixtures is suitable for making buffers?

Question

1 H3PO4 and NaH2PO4
2 Na2CO3 and NaHCO3
3 NH4Cl and NH3

a. 1 only

b. 2 only

c. 3 only

d. 1 and 2 only

e. 1, 2, and 3

Answer 1

Buffers are a weak acid and one of its salts or a weak base and one of its salts.