What is the geometry of the carbonate dianion, $C O_{3}^{2 -}$ $CO_3^(2-)$ ?

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What is the geometry of the carbonate dianion, $C O_{3}^{2 -}$ $CO_3^(2-)$ ?

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Answer 1 · 2017-05-02T16:41:00

Carbonate anion is trigonal planar to a first approximation.........

Explanation:

We have $4 + 3 \times 6 + 2 = 24 \cdot electrons$ $4+3xx6+2=24*"electrons"$ to distribute around 3 oxygen and 1 carbon atoms.......

A Lewis structure gives $O = C {(- O^{-})}_{2}^{-}$ $O=C(-O^(-))_2$ , which gives one neutral ( $s p^{2} - hybridized$ $sp^2-"hybridized"$ ) oxygen, and 2 formally anionic oxygen centres ( $s p^{3} - hybridized$ $sp^3-"hybridized"$ )......The central carbon is $s p^{2} - hybridized$ $sp^2-"hybridized"$ .

If we ignore the $π - bond$ $pi-"bond"$ , there are THREE regions of electron density around the central carbon, and trigonal planar geometry is adopted, with $∠ O - C - O = 120^{\circ}$ $/_O-C-O=120^@$ .

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What is the geometry of the carbonate dianion, $C O_{3}^{2 -}$ $CO_3^(2-)$ ?

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What is the geometry of the carbonate dianion, $C O_{3}^{2 -}$ $CO_3^(2-)$ ?