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At 25 degrees Celsius the ionic product of water Kw equals the product of which two concentrations?
AHydronium ion and chloride ion concentrations
BHydronium ion and hydroxyl ion concentrations
CSodium ion and hydroxyl ion concentrations
DHydronium ion and oxide ion concentrations
Answer & Solution
Correct answer: B. Hydronium ion and hydroxyl ion concentrations
1. Water self-ionises to give hydronium ions and hydroxyl ions.
2. The ionic product of water is the product of the concentration of the hydronium ion and the hydroxyl ion.
3. So Kw = [H3O+][OH-]; ions like chloride or sodium come from added solutes, not from pure water's self-ionisation.
4. Therefore Kw is the product of the hydronium ion and hydroxyl ion concentrations.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Ionic Product of Water", p.155_
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