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Ion Product For Water
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What is Ion Product For Water?
The ion product for water (Kw) is the equilibrium constant for the autoionization of water: 2H₂O ⇌ H₃O⁺ + OH⁻, expressed as Kw = [H₃O⁺][OH⁻]. At 25°C, Kw = 1.0 × 10⁻¹⁴, which defines the pH scale: in pure water, [H⁺] = [OH⁻] = 1.0 × 10⁻⁷ M (pH = 7.0). Kw increases with temperature, reflecting the endothermic nature of water autoionization.
Key Facts
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Ion Product For Water
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Frequently Asked Questions
The ion product for water (Kw) is the equilibrium constant for the autoionization of water: 2H₂O ⇌ H₃O⁺ + OH⁻, expressed as Kw = [H₃O⁺][OH⁻]. At 25°C, Kw = 1.0 × 10⁻¹⁴, which defines the pH scale: in pure water, [H⁺] = [OH⁻] = 1.0 × 10⁻⁷ M (pH = 7.0). Kw increases with temperature, reflecting the endothermic nature of water autoionization.
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