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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
Which will make basic buffer?
  • A
     $50 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}+25 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$
  • B
    $100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}+100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$
  • ✓
    $100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{HCl}+200 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NH}_{4} \mathrm{OH}$
  • D
     $100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{HCl}+100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$
✓

Answer

Correct option: C.
$100 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{HCl}+200 \mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NH}_{4} \mathrm{OH}$
c
Basic buffer is mixture of weak base and salt of weak base with strong acid

milli mole of $\mathrm{HCl}=100 \times 0.1=10$ milli mole

milli mole of $\mathrm{NH}_{4} \mathrm{OH}=200 \times 0.1=20 \mathrm{mill}$ imole

$\mathrm{HCl}+\mathrm{NH}_{4} \mathrm{OH} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}+\mathrm{H}_{2} \mathrm{O}^{-}$

$10 \quad \quad \quad 20\quad \quad \quad \quad -\quad \quad -$

$-\quad \quad \quad 10\quad \quad \quad \quad  10\quad \quad \quad -$

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