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Ionic Equilibrium — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryIonic Equilibrium1 Mark
MCQ
pH of a solution is 5. Its hydroxyl ion concentration is …………..
  • A
    5
  • B
    10
  • C
    $10^{-5}$
  • ✓
    $10^{-9}$
✓

Answer

Correct option: D.
$10^{-9}$
(d) $10^{-9}$
pH = 5 means $[H^+] = 10^{-5}$
pOH = 14 – pH = 14 – 5 = 9
$[OH^-] = 10^{-pOH}= 10^{-9}$

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