Problem: How many resonance structures can be drawn for PO43−?

FREE Expert Solution

We are being asked to identify the resonance structuresof acetate ion (PO43−). We will have to draw the Lewis Structure of PO43− first.

Step 1: Determine the central atom in this molecule.

 P is less electronegative than O so P is the central atom.

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

CH3COO-:

          Group              Valence Electrons

P         5A                    5 valence e x 1
O         6A                    6 valence e- x 4
                                 = 29 valence e

-3 charge                     +3 e­-

 Total = 32 valence v


Step 3: Draw the Lewis Structure for the molecule

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

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Problem Details

How many resonance structures can be drawn for PO43−?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Resonance Structures concept. You can view video lessons to learn Resonance Structures. Or if you need more Resonance Structures practice, you can also practice Resonance Structures practice problems.