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Because that will always equal the Kw or the ionization constant for water. From the equations of two water molecules in equilibrium with [H3O+] and [OH-], liquids are not written in the Kw, so only [H30+] and [OH-] will be in the equation making those two equal to the ionization constant (Kw).
The equilibrium constant for any reaction, is called the water dissociation constant which is Kw. Because every H+ (H3O+) ion that forms is accompanied by the formation of an OH- ion, the concentrations of these ions in pure water are the same and can be calculated from Kw. Therefore, Kw = [H3O+][OH-] = 1 × 10^-14
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