Question: Which combinations of compounds can make a buffer solution? 1. NaHCO3 and NaCl 2. H3PO4 and NaH2PO4 3. NH3 and (NH4)3PO4 4. NaOH and NaCl

Which combinations of compounds can make a buffer solution?
1. NaHCO3 and NaCl
2. H3PO4 and NaH2PO4
3. NH3 and (NH4)3PO4
4. NaOH and NaCl

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