$A$ buffer solution is formed by a weak acid and its salt with a strong base,or a weak base and its salt with a strong acid. In which of the following pairs is this characteristic found?
- A$HCl$ and $NaCl$
- B$NaOH$ and $NaNO_3$
- C$KOH$ and $KCl$
- D$NH_4OH$ and $NH_4Cl$
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