The Common- Ion Effect Refers to the Observation _

question 68

Multiple Choice

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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