the solubility of BaF2 is 6.29x10^-3M and the solubility of barium fluoride in 0.15M NaF is 4.4x10^-5M. Compare the solubility and explain?

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  1. BaF2 ==> Ba^+2 + 2F^-

    NaF ==> Na^+ + F^-

    Solubility BaF2 alone = the above number
    Solubility mixture BaF2 and 0.15 M NaF = a much smaller number. Why? Because of the common ion effect (the fluoride ion from NaF) shifts the BaF2 equilibrium to the left which results in a lower solubility of BaF2 in the mixture.

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