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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
What would be the $pH$ of a solution obtained by mixing $5\,g$ of acetic acid and $7.5\,g$ of sodium acetate and making the volume equal to $500\, mL$ ? $(K_a = 1.75 \times 10^{-5},pK_a =4.76)$
  • A
    $pH=4.70$
  • B
    $pH < 4.70$
  • C
    $pH$ of solution will be equal to $pH$ of acetic acid
  • ✓
    $4.76 < pH < 5.0$
✓

Answer

Correct option: D.
$4.76 < pH < 5.0$
d
$pH = p{K_a} + \log \,\frac{{[salt]}}{{[acid]}}$

$ = 4.76 + \log \,\frac{{\frac{{7.5}}{{500}}}}{{\frac{5}{{500}}}} = 4.7 + \log \,1.5 = 4.87$

Hence correct answer is $4.76 < pH < 5.0$

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