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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
A buffer solution contains $100\, ml$ of $0.01\, M \,CH_3COOH$ and $200\, ml$ of $0.02\, M\, CH_3COONa\,.\,700\, ml$ of $1\,M\, NaCl$ is added than $pH$ before and  after addition are $(pK_a = 4.74)$
  • A
    $5.04, 5.04$
  • B
    $5.34, 6.30$
  • C
    $5.04, 1.54$
  • ✓
    $5.34, 5.34$
✓

Answer

Correct option: D.
$5.34, 5.34$
d
$\mathrm{pH}=\mathrm{pKa}+\log _{10} \frac{[\mathrm{salt}]}{(\mathrm{Acid})}$

$\mathrm{pH}=4.74+\log \frac{[0.02 \times 200]}{(0.01 \times 100)}=4.74+0.60$

$=5.34$

$\mathrm{NaCl}$ is neutral salt therefore only dilution talke place

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