The common- ion effect refers to the observation _ . A) ions such as K⁺and Na⁺are common ions, so that their values in equilibrium constant expressions are always 1.00 B) that the selective precipitation of a metal ion, such as Ag⁺, is promoted by the addition of an appropriate counterion (X^-) that produces a compound (AgX) with a very low solubility C) that some ions, such as Na⁺(aq), frequently appear in solutions but do not participate in solubility equilibria D) common ions, such as Na⁺(aq), don't affect equilibrium constants E) that common ions precipitate all counter- ions

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The common-ion effect refers to the observation that the addition of an ion that is already present in a solution can cause a shift in the equilibrium position. In the case of selective precipitation, the addition of a counterion that forms a compound with very low solubility can promote the precipitation of a metal ion. This is an example of the common-ion effect.

The Common- Ion Effect Refers to the Observation _