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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
Given $pH $ of a solution $ A$ is $3$ and it is mixed with another solution $B$ having $pH\, 2$. If both mixed then resultant $pH$ of the solution will be
  • A
    $3.2$
  • ✓
    $1.9$
  • C
    $3.4$
  • D
    $3.5$
✓

Answer

Correct option: B.
$1.9$
(b) $pH $ of the solution $A = 3$

$[H+]_A = 10^{-3} M.$

$pH $ of the solution $B = 2$

$[H^+]_B =10^{-2} M$

$[H^+] = 10^{-3} + 10^{-2} = 10^{-3} + 10 × 10^{-3} = 11 \times 10^{-3}$.

$pH = -log(11 \times 10^{-3}) = 3 -log 11$ $= 3 -1.04 = 1.95$

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