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Chemistry · Glossary

What is Ionic product of water?

Definition 44.9 School Chemistry — Grades 1 to 12 · Chapter 44 — Acids and Bases: Ka and pKa

Water reacts very slightly with itself, 2 HX2O⇌HX3OX++OHX−\ce{2H2O <=> H3O+ + OH-}. The equilibrium constant of this reaction is the ionic product of water:

Ke=[HX3OX+] [OHX−](c∘)2,pKe=−log⁡Ke.K_e = \frac{[\ce{H3O+}]\,[\ce{OH-}]}{(c^\circ)^2}, \qquad pK_e = -\log K_e .
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