We are being asked to determine if the concentration of F- ions will increase or decrease when CaCl2 is added to a solution containing undissolved CaF2 in equilibrium.
Recall: If our compound dissolves in a solution with similar ions then the Common Ion Effect takes place.
Consider a beaker containing a saturated solution of CaF2 in equilibrium with undissolved CaF2(s). Solid CaCl2 is then added to the solution.
Will the concentration of F- ions in solution increase or decrease?
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