• 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)

  • The common-ion effect has no effect on Ksp! Calculations
  • Asked to calculate the solubility of solid in a solution of another compound ○ Write balanced, dissolution equation and ICE table

             ■ Nothing in the Solid column, difference is that will have initial value for the ion that is present in solution