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(C) buffer solution is formed by:$(i)$ Mixing a weak acid and its salt with a strong base,e.g.,$CH_3COOH$ and $CH_3COONa$.$(ii)$ Mixing a weak base an

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$A$ and $C$

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(C) buffer solution is formed by:$(i)$ Mixing a weak acid and its salt with a strong base,e.g.,$CH_3COOH$ and $CH_3COONa$.$(ii)$ Mixing a weak base and its salt with a strong acid,e.g.,$NH_4OH$ and $NH_4Cl$.In the given options,$C$ ($NH_4OH$,a weak base) and $A$ ($NH_4Cl$,a salt of a weak base and strong acid) form a basic buffer.Similarly,$D$ ($CH_3COOH$,a weak acid) and $B$ ($CH_3COONa$,a salt of a weak acid and strong base) form an acidic buffer.However,in the context of standard multiple-choice questions where only one pair is expected,both $(A+C)$ and $(B+D)$ are valid buffer systems. Given the options,$(A+C)$ is a classic basic buffer pair.

All the given solutions have the same concentration. Mixing equal volumes of which of the following will produce a buffer solution?
$A = NH_4Cl$; $B = CH_3COONa$; $C = NH_4OH$; $D = CH_3COOH$

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All the given solutions have the same concentration. Mixing equal volumes of which of the following will produce a buffer solution?$A = NH_4Cl$; $B = CH_3COONa$; $C = NH_4OH$; $D = CH_3COOH$