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Ionic Product of Water

The product of H3O+ and OH concentration for any solution (acidic, basic, or neutral) at any temperature is a constant called the ionic product (auto-protolysis constant) of water.
Kw = [H3O+] [OH] = ()2
Kw is called the ionic product of water. The value of Kw at 25°C is 1 × 10–14, and it is temperature dependent.

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