Problem: Write resonance forms that describe the distribution of electrons in each of these molecules or ions. the formate ion:

FREE Expert Solution

We are being asked to identify the resonance forms that describe the distribution of electrons in formate ion (HCO2-). 


We will have to draw the Lewis Structure of HCO2- first.


Step 1: Determine the central atom in this molecule.

 C and H are less electronegative than O but H can only make one bond
•  C is the central atom and is bonded to the H and 2 O atoms


Step 2: Calculate the total number of valence electrons present.          

HCOO-:

          Group              Valence Electrons

C          4A                    4 valence e x 1
H           1A                      1 valence e x 1
O           6A                      6 valence e- x 2
                                      = 17 valence e

      -1 charge                     +1 e­-

 Total = 18 valence e-


Step 3: Draw the Lewis Structure for the molecule

O and C → prefers to have complete octet (8 e- around them)

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Problem Details

Write resonance forms that describe the distribution of electrons in each of these molecules or ions.

 the formate ion:

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