Question

Which one of the pairs will form a buffer solution?

• A. $CH_3COONa$ & $NaOH$
• B. $CH_3COONH_4$ & $NH_4Cl$
• C. $NH_4Cl$ & $NH_4OH$
• D. $CH_3COONa$ & $HCl$

Hint:

To identify a buffer quickly, look for "Weak" + "Salt." If you see a "Strong" component (like $NaOH$, $HCl$, or $HNO_3$) paired only with a salt, it is usually a distractor unless a chemical reaction is specified with specific molar ratios.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
A basic buffer is a mixture of a weak base and its salt with a strong acid.
Step 3: Detailed Explanation:
\(NH_{4}OH\) is a weak base. \(NH_{4}Cl\) is the salt of this weak base with strong acid \(HCl\).
Together they form a basic buffer.
Step 4: Final Answer:
Pair (C) forms a buffer.