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ionic product


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The product of the concentrations of ions present in a given solution taking the stoichiometry into account. For a sodium chloride solution the ionic product is [Na+][Cl]; for a calcium chloride solution it is [Ca2+][Cl]2. In pure water, there is an equilibrium with a small amount of self-ionization:H2O⇌H++OH The equilibrium constant of this dissociation is given by KW=[H+][OH] since the concentration [H2O] can be taken as constant. KW is referred to as the ionic product of water. It has the value 10−14 mol2 dm−6 at 25°C. In pure water (i.e. no added acid or added alkali) [H+]=[OH]=10−7 mol dm−3. In this type of self-ionization of a solvent the ionic product is also called the autoprotolysis constant. See also solubility product; pH scale.

H2O⇌H++OH

KW=[H+][OH]

Subjects: Chemistry.


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