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Question
Which of the following will produce a buffer solution when mixed in equal volumes?
Options
0.1 mol dm–3 \[\ce{NH4OH}\] and 0.1 mol dm–3 \[\ce{HCl}\]
0.05 mol dm–3 \[\ce{NH4OH}\] and 0.1 mol dm–3 \[\ce{HCl}\]
0.1 mol dm–3 \[\ce{NH4OH}\] and 0.05 mol dm–3 \[\ce{HCl}\]
0.1 mol dm–3 \[\ce{CH4COONa}\] and 0.1 mol dm–3 \[\ce{NaOH}\]
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Solution
0.1 mol dm–3 \[\ce{NH4OH}\] and 0.05 mol dm–3 \[\ce{HCl}\]
Explanation:
When 0.1 mol dm–3 \[\ce{NH4OH}\] and 0.05 mol dm–3 \[\ce{HCl}\] react total amount of \[\ce{HCl}\] reacts with \[\ce{NH4OH}\] to form \[\ce{NH4Cl}\] and some \[\ce{NH4OH}\] will be left unreacted. Thus, the resultant solution contains \[\ce{NH4Cl}\] and \[\ce{NH4OH}\] which will produce a buffer solution.
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