1 answer

Lewis structures

Question:

Draw the Lewis structure of bicarbonate (HCO3-) showing all possible resonance structures if there are any. Determine the formal charge of each atom.

Answers

There are 2 possible resonance structures for HCO3-:

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Formal charge of C = 4 - 0 - 8/2 = 0

Formal charge of H = 1 - 0 - 2/2 = 0

Formal charge of O (double bond C=O) = 6 - 4 - 4/2 = 0

Formal charge of O (single bond C-O) = 6 - 6 - 2/2 = -1

Formal charge of O (OH) = 6 - 4 - 4/2 = 0

Formal charge = number of valence electrons in free atom - number of unbonded valence electrons in bonded atom - (number of shared electrons incovalent bonds)/2

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