Question: Which combinations of compounds can make a buffer? Assume aqueous solutions. a. H3PO4 and Na3PO4 b. NaHCO3 and Na2CO3 c. NaNO3 and Ca(NO3)2 d. HN3

Which combinations of compounds can make a buffer? Assume aqueous solutions.
a. H3PO4 and Na3PO4
b. NaHCO3 and Na2CO3
c. NaNO3 and Ca(NO3)2
d. HN3 and NH3

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