Question

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

विकल्प

• 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 \[\ce{NaOH}\]

Answer 1

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.