मराठी

Autoionization of Water

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Autoionisation of Water

Pure water is a weak electrolyte that self-ionises:

H2O(l) + H2O(l) ⇌ H3O+(aq) + OH(aq)

Ionic product of water:

Kw = [H3O+][OH]

At 298 K (pure water): [H₃O⁺] = [OH⁻] = 1.0 × 10-7 mol/L

∴ Kw = 1.0 × 10−14
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