The pH of an aqueous solution is 5.5. The hydroxyl ion concentration in the solution will be:
Correct answer: A. 10⁻⁸·⁵
- A. 10⁻⁸·⁵
- B. 10⁸⋅⁵
- C. 8.5
- D. -8.5
Explanation
The pOH of the solution is 14 - pH = 14 - 5.5 = 8.5. The hydroxyl ion concentration is given by [OH⁻] = 10⁻pOH. Therefore, [OH⁻] = 10⁻⁸.⁵ M.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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