The correct relationship between Ka & Kb at 25°C for water is
Correct answer: A. Ka × Kb = Kw
- A. Ka × Kb = Kw
- B. Ka × Kb = [H+][OH-]
- C. Ka × Kb = 10-14
- D. None of these
Explanation
The correct relationship between Ka and Kb at 25°C is Ka × Kb = Kw, where Kw is the ion product of water, equal to 1.0 × 10-14 at this temperature. Option A is correct as it clearly states this relationship. Option B, while equivalent to Kw's definition, does not explicitly mention it, making it less clear. Option C provides the numerical value of Kw but omits the term, reducing clarity. Option D is incorrect because Option A accurately expresses the relationship.
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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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