AP Chemistry · Unit 7: Equilibrium
7.12 Common-Ion Effect
In short
You must understand that the solubility of a salt is reduced when it is dissolved into a solution that already contains one of the ions present in the salt. The impact of this 'common-ion effect' on solubility must be understood qualitatively using Le Châtelier's principle, and you must be able to calculate it quantitatively from the Ksp for the dissolution process.
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How is Common-Ion Effect tested on the exam?
This topic is assessed alongside the science practice skill 2.F (Explain how modifications to an experimental procedure will alter results).
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Common-Ion Effect: common questions
What do you need to know about Common-Ion Effect for AP Chemistry?
You must understand that the solubility of a salt is reduced when it is dissolved into a solution that already contains one of the ions present in the salt. The impact of this 'common-ion effect' on solubility must be understood qualitatively using Le Châtelier's principle, and you must be able to calculate it quantitatively from the Ksp for the dissolution process.
How is Common-Ion Effect tested on the AP Chemistry exam?
This topic is assessed alongside the science practice skill 2.F (Explain how modifications to an experimental procedure will alter results).
Where does Common-Ion Effect fit in AP Chemistry?
Common-Ion Effect is topic 7.12 in Unit 7: Equilibrium of AP Chemistry.
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