According to the common ion effect, if we keep adding a freely soluble salt of an anion to a system containing a sparingly soluble salt with that same anion, the dissolution of the sparingly soluble salt should become less and less. There are cases, however, when continuing to increase the anion concentration will eventually lead to increased dissolution of the sparingly soluble salt. Explain this phenomenon.

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter16: Solubility And Precipitation Equilibria
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According to the common ion effect, if we keep adding a freely soluble salt of an anion to a system containing a sparingly soluble salt with that same anion, the dissolution of the sparingly soluble salt should become less and less. There are cases, however, when continuing to increase the anion concentration will eventually lead to increased dissolution of the sparingly soluble salt. Explain this phenomenon. 

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