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Question

Does common ion effect increase solubility?


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Solution

Common ion effect: This effect persists when any salt is added to a solution containing either the same cation or anion which leads to a change in solubility.

  • The solubility of the salt added is affected by the common ion which is already present in the solution.
  • The solubility of a salt is considerably reduced when it is dissolved in a solution that already contains one of its ions, rather than in a pure solvent.

For example, when gaseous hydrogen chloride (HCl) is passed through a sodium chloride (NaCl) solution, leading to the precipitation of NaCl due to the excess of chloride (Cl-) ions in the solution. Hence, we can conclude that the common ion effect will decrease the solubility.


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