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Kw (Water Dissociation Constant) in AP Chemistry

Written by the Fiveable Content Team
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team

Definition

The water dissociation constant, Kw, is the equilibrium constant for the self-ionization of water into hydrogen ions and hydroxide ions. It's a measure of the concentration of these ions in pure water at a specific temperature.

AP course connection

Topic 8.2: 8.2 pH and pOH of Strong Acids and Bases

Unit 8

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