The common ion effect is a case of Hess's law.

Name: The common ion effect is a case of Hess's law.
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The common ion effect is not a case of Hess's law, which states that the overall enthalpy change in a chemical reaction is independent of the pathway between the initial and final states. The common ion effect refers to the decrease in solubility of a salt when a common ion is added to the solution, due to the shift in equilibrium towards the production of the less soluble ionic compound.

The Common Ion Effect Is a Case of Hess's Law