Did you understand that the skeleton in ours body deteriorate majorly of phosphate ion (tricalcium phosphate)? It’s no only existing in our bones however even in our this as well. The sounds quite interesting, right?

It’s not only essential for humans however for plants together well. So it’s crucial we learn around this compound and also see what provides it so special.

You are watching: Lewis structure for po43- with formal charges

Phosphate or PO43- is a trivalent not natural anion that is derived from phosphoric acid. It consists of a number of salts the contain the phosphate ion, the dihydrogen phosphate ion, and lots of cations (positive charge) favor calcium, sodium, etc. That occurs normally in food, water also in humans (bones, teeth, and also genes).

USA, China, and also Morocco are currently the top producers the phosphate as result of the maximum visibility of phosphate rocks (minerals) in these countries.

Now the you establish its importance, let us examine PO43- in detail and also learn around its Lewis structure, Hybridization, shape, and also polarity.

PO43- Lewis Structure

Before we begin to draw the Lewis framework of PO43- action by step let us look at an overview of exactly how the Lewis structure will look like.

To attract the Lewis framework of any kind of compound, we always use the concept of valence electrons (number of electron in the outer shell of every atom).

The all at once charge top top the phosphate ion is -3 and the phosphorus atom is in one oxidation state the +5.

In the Lewis structure of PO43-, ns forms solitary bonds with 3 oxygen atoms and forms a double bond with one oxygen atom. This oxygen atoms carry a charge of -1.

Let us now look that steps required for drawing a Lewis structure:-

1. Counting the total number of valence electron of the molecule.

2. Locating the central atom the the molecule.

3. Arranging the electrons together lone bag to kind bonds with each atom.

4. Plan of the remaining valence electron so the each atom completes that octet.

5. Converting potential lone pairs into twin or triple bonds to do the molecule more stable. We also check the formal fee of every atom and make sure that that is the lowest possible.


The ideal Lewis framework of any kind of molecule will have 0 together the appropriate formal fee for each atom. The formula for calculating formal fee is given below:-

Steps of illustration lewis structure of PO43-

1. Let us count the total variety of valence electrons because that the molecule PO43-. Ns belongs to team 5, hence has actually 5 valence electrons. O belongs to team 6, hence has actually 6×4= 24 valence electrons (4 atom of O).

Now there is a charge of -3 ~ above the totality atom which method there are 3 additional valence electron present. Hence, total number of valence electron is 5+24+3= 32 valence electrons.

2. The atom which has actually the highest valence factor, and the greatest bonding sites, is termed together the central atom. Following this thinking P is the central atom that PO43-.

3. Now we begin arranging this electrons together lone pairs on each atom so the it resembles a chemistry bond. 8 valence electron are provided up because that this.

4. Now we kinds the staying 24 valence electrons roughly each atom so that it completes that octet. We observe that all 32 valence electron are now used up.

5. Currently we inspect the formal fee of every atom that PO43-. We watch that P has actually a +1 charge and also all the O atoms have actually a -1 charge. Now, this looks every fine.


But is this the shortest formal charge possible? Remember the the dues on every atom the a molecule make it more unstable. So the best Lewis structure need to ideally have each atom v a charge of 0 top top it.

In PO43-, P can hold more than 8 valence electron (period 5). So, if P provides a double bond with among the oxygen atom then ns will have a fee of 0 and also so will the doubly external inspection O atom. The remainder 3 O atom will have a -1 charge, thus offering rise to the -3 charge on the molecule.

We cannot induce more dual bonds through O because that the basic reason that ns will acquire a -1 fee which will make the molecule very unstable.

Thus, we acquire the required ideal Lewis structure for PO43-.

PO43- Hybridization


Let us now take a look in ~ the Hybridization that the molecule which will offer us much more information ~ above the nature of your chemical bonds.

The Hybridization of PO43- is Sp3.

This can be construed through two methods:-

Method 1: The theory aspect- Hybridization the PO43- have the right to be uncovered by including the number of bonds and also the lone pair that the central atom. The value of Hybridization (H) is identified by:-

If H=2 climate it’s sp hybridized.

If H=3, then its sp2 hybridized.

H=4 way that that sp3 hybridized.

H=5 means that that is sp3d hybridized.

And H=6 method that that is sp3d2 hybridized.

In PO43-, we understand P is the main atom. It makes 4 sigma bonds with each O atom (double bonds/triple bond are taken into consideration as one sigma bond) and it has no lone pairs present on it. So total value of H is 4, which renders the molecule Sp3 hybridized.

Method 2: Next we concerned the formula aspect of hybridization. This is helpful if you don’t remember the theory.The formula to uncover the Hybridization of any kind of molecule is provided below:-

H= 1/2

H= Hybridization of the molecule

V= variety of Valence electron of the central atom.

C= fee on cation or much more electropositive atom.

A= fee on anion or an ext electropositive atom.

Now let us look at PO43-,

Here p is the central atom for this reason V =5 (valence electrons)

M= 0, since Oxygen (O), is a divalent atom, so there are no monovalent atom bonded come the main atom.

C = 0 (charge ~ above P)

A= -3 (Combined fee of O atoms)



H=4, indicating the PO43- is sp3 hybridized.

Hence, the hybridization that PO43- deserve to be found by using these two methods.

PO43- molecular Geometry

The next necessary step is to recognize the molecule geometry that PO43-.

The molecule geometry the a molecule provides its shape and also the bond angles.

The molecule geometry the PO43- is Tetrahedral. The bond edge formed in between each atom is 109.5 degrees.

The notation AXN deserve to be supplied to determine the molecule geometry of any kind of molecule. A denotes the number of main atoms.

X denotes the variety of atoms that are chemically bonded to the main atom. And also finally, N denotes the lone bag on the main atom ( the nonbonding electrons).

Looking at PO43-, A=1 since P is the only main atom. X= 4 as there 4 atom of O attached come the main atom. N will certainly be zero together all the electrons are affiliated in bonding and there space no lone pairs. Hence using the formula, we obtain the shape for PO43- together AX4.

If we look up this notation in the VSEPR chart given below we uncover that PO43- has a tetrahedral shape.


PO43- Polarity

PO43- is a non-polar molecule.

Electronegativity distinction is the key factor due to which polarity wake up in a molecule. Polar molecule usually have an asymmetrical shape and their net dipole moment is never zero.

The electronegativity difference in between P (2.1) and also O(3.5) is better than 0.5 do the P-O bond polar. However is PO43- together a molecule polar?

For that, we very first draw that is Lewis structure and also then draw the dipole moments because that each bond. As result of PO43- having a symmetrical structure, the dipole moments cancel each other out rendering the molecule non-polar.

To confirm this fact, we can also take a look at its molecule geometry. It has a tetrahedral form with every dipole moment going in opposing direction, do the net dipole minute 0 which renders PO43- a non-polar molecule.


The molar fixed of PO43- is 94.97 g/mol. It is extensively used in toothpaste together polishing and also a air conditioning agent. That is likewise used in various cleaning agents and pesticides as well making it quite valuable for obtaining rid of dirt.

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So now, we have actually learned everything we need to know about the PO43- molecule ranging from its Lewis structure, hybridization, molecular geometry, and polarity.

Now you have strengthened your basics because that the molecule P043-. If friend have any type of doubts concerning the above-mentioned points please feel complimentary to resolve me. Study Well!