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A common ion is defined as one that is also produced by the:
AEvaporation of the water
BHeating of the container
CFiltering of the mixture
DDissolution of the compound
Answer & Solution
Correct answer: D. Dissolution of the compound
1. The word common points to an ion shared by two sources.
2. Solubility is less in aqueous solutions containing a common ion.
3. A common ion is one also produced by dissolution of the ionic compound.
4. Adding it from another source suppresses further dissolution.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 15 'Equilibria of Other Reaction Classes', sections 15.1-15.3_
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