Which of the following solution cannot act as a buffer?
NaH2PO4+H3PO4
CH3COOH+CH3COONa
H3PO4+Na2HPO4
HCl+NH4Cl
A
CH3COOH+CH3COONa
B
HCl+NH4Cl
C
H3PO4+Na2HPO4
D
NaH2PO4+H3PO4
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Solution
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A mixture of weak acid and a salt of strong base, or a mixture of weak base and a salt of strong acid acts as a buffer.
NaH2PO4+H3PO4 ,CH3COOH+CH3COONa and H3PO4+Na2HPO4 have an acid/base pair.
Therefore they act as a buffer.
A mixture of strong acid and its salt of strong acid don't make an effective buffer.
Therefore, HCl+NH4Cl cannot act as a buffer.
Hence the correct option is C.
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