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  4. Which of the following will produce a buffer solution when mixed in equal volumes?

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Q. Which of the following will produce a buffer solution when mixed in equal volumes?

Equilibrium

Solution:

In $0.1 \,mol \,dm^{-3}\, NH_4OH$ and $0.05 \,mol\, dm^{-3}\, HCl$, total amount of $HCl$ reacts with $NH_4OH$ to form $NH_4Cl$ and some $NH_4OH$ will be left unreacted. Thus, the resultant solution contains $NH_4Cl$ and $NH_4OH$ which will produce a buffer solution.