pH of an aqueous solution is 5.5 the hydroxyl ion conc. 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
To find the concentration of hydroxyl ions, we first determine the pOH of the solution. Since pH + pOH = 14, we have pOH = 14 - 5.5 = 8.5. The concentration of hydroxyl ions is then given by [OH−] = 10−pOH = 10−8.5. Therefore, option A is correct. Options B and C are numerically and conceptually incorrect, and option D is not a valid expression for ion concentration.
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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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