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21 October, 19:29

Consider the resonance structures for the carbonate ion. carbonate is a carbon double bonded to an oxygen with two lone pairs and single bonded to two oxygens, each with three lone pairs and a negative charge. The three resonance structures are all equivalent. How much negative charge is on each oxygen of the carbonate ion? 0 - 1.33 - 0.33 - 0.67 - 0.50 - 2.00 - 1.00 - 1.67 - 1.50 What is the bond order of each carbon‑oxygen bond in the carbonate ion?

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  1. 21 October, 19:47
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    The correct answers are: Each oxygen of carbonate ion has - 2/3 or - 0.67 charge.

    Bond order of each carbon‑oxygen bond in the carbonate ion = 1.33

    Explanation:

    The carbonate ion (CO₃²⁻) is an organic compound, in which a carbon atom is covalently bonded to three oxygen atoms. The net formal charge on a carbonate ion is - 2.

    The carbonate ion is resonance stabilized and has three equivalent resonating structures, which exhibits that all the three carbon-oxygen bonds in a carbonate ion are equivalent.

    In the resonance hybrid of carbonate ion, the negative charge is equally delocalized on all the three oxygen atoms.

    Thus, each bonded oxygen has - 2/3 or - 0.67 charge.

    In a carbonate ion there is one double bond oxygen (C=O) and two single bonded oxygen (C-O). Bond order of 1 C=O is 2 and bond order of C-O is 1.

    ∴ Bond order = sum of all bond orders : number of bonding groups = (2+1+1) : 3 = 1.33
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