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Explain the important aspects of resonance with reference to the CO_3^2- ion

4.11     Explain the important aspects of resonance with reference to the CO_{3}^{2-} ion

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The single Lewis structure based on the presence of two single bonds and one double bond between carbon and oxygen atoms is inadequate to represent the molecule accurately as it represents unequal bonds. According to the experimental findings, all carbon to oxygen bonds in CO3 2– are equivalent. Therefore the carbonate ion is best described as a resonance hybrid of the canonical forms I, II, and III shown below.

carbonante resonance

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