Identify a buffer, or what an acidic or basic buffer is made of

1. A.
   NH$_4$OH + NH$_4$Cl
2. B.
   $\text{C}_6\text{H}_5\text{COOH} + \text{C}_6\text{H}_5\text{COONa}$
3. C.
   HCOOH + HCOOK
4. D.
   CH$_3$COOH + CH$_3$COONa

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1. A.
   strong acid and its salt with weak base.
2. B.
   strong base and its salt with weak acid.
3. C.
   weak acid and its salt with strong base.
4. D.
   weak base and its salt with strong acid.

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1. A.
   Acetic acid and sodium acetate
2. B.
   Acetic acid and ammonium chloride
3. C.
   Ammonium hydroxide and sodium chloride
4. D.
   Formic acid and acetic acid

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