AP Chemistry Unit 7.12 Common-Ion Effect

Common-Ion Effect

  • Common-Ion Effect: when you try to dissolve the solid in a solution with either the cation or anion already present less solid will dissolve/more solid will be produced → the solubility of that salt is going to be less that it was in pure water
    • Q > Ksp → reaction will shift to consuming more ions and producing more reactant (shift left) (more solid forming)


  • Asked to calculate the solubility of solid (s) in a solution of another compound
    • Write balanced equation [dissolution/ions on product side] and ICE table
      • Nothing in the Solid column, difference is that will have initial value for the ion that is present in solution
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