Did you recognize that the bones in ours body deteriorate majorly that phosphate ion (tricalcium phosphate)? It’s no only existing in our bones but even in our this as well. That sounds fairly interesting, right?

It’s no only vital for humans however for plants together well. Therefore it’s vital we learn around this compound and see what makes it for this reason special.

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Phosphate or PO43- is a trivalent not natural anion the is acquired from phosphoric acid. It is composed of a variety of salts the contain the phosphate ion, the dihydrogen phosphate ion, and lots of cations (positive charge) favor calcium, sodium, etc. It occurs normally in food, water as well in human beings (bones, teeth, and genes).

USA, China, and Morocco are currently the leading producers that phosphate due to the maximum existence of phosphate rocks (minerals) in these countries.

Now that you realize its importance, allow us research PO43- in detail and learn about its Lewis structure, Hybridization, shape, and also polarity.

PO43- Lewis Structure

Before we start to attract the Lewis framework of PO43- step by step let us look at summary of exactly how the Lewis structure will look at like.

To attract the Lewis structure of any compound, we constantly use the concept of valence electrons (number of electron in the external shell of every atom).

The overall charge on the phosphate ion is -3 and also the phosphorus atom is in one oxidation state of +5.

In the Lewis structure of PO43-, p forms single bonds v 3 oxygen atoms and also forms a dual bond through one oxygen atom. This oxygen atoms lug a charge of -1.

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

1. Counting the total variety of valence electrons of the molecule.

2. Locating the main atom that the molecule.

3. Arranging the electrons together lone bag to form bonds through each atom.

4. Arrangement of the continuing to be valence electron so that each atom completes its octet.

5. Convert potential lone pairs into twin or triple bond to do the molecule an ext stable. We additionally check the formal charge of each atom and make sure that the is the shortest possible.


The best Lewis structure of any type of molecule will have actually 0 together the right formal charge for each atom. The formula for calculating formal fee is provided below:-

Steps of drawing lewis framework of PO43-

1. Let us count the total number of valence electrons for the molecule PO43-. Ns belongs to group 5, hence has actually 5 valence electrons. O belongs to group 6, hence has 6×4= 24 valence electrons (4 atoms of O).

Now over there is a charge of -3 top top the whole atom which way there are 3 added valence electrons present. Hence, total number of valence electrons is 5+24+3= 32 valence electrons.

2. The atom which has actually the greatest valence factor, as well as the highest possible bonding sites, is termed together the main atom. Complying with this thinking P is the central atom that PO43-.

3. Now we start arranging these electrons as lone pairs on each atom so the it each other a chemical bond. 8 valence electrons are supplied up because that this.

4. Now we species the staying 24 valence electrons about each atom so the it completes the octet. We observe the all 32 valence electron are currently used up.

5. Currently we examine the formal charge of each atom the PO43-. We see that P has 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 each atom the a molecule make it more unstable. So the finest Lewis structure have to ideally have actually each atom through a fee of 0 ~ above it.

In PO43-, P have the right to hold much more than 8 valence electron (period 5). So, if P renders a double bond with among the oxygen atom then p will have actually a fee of 0 and so will the doubly bonded O atom. The rest 3 O atoms will have a -1 charge, thus offering rise come the -3 fee on the molecule.

We can not induce more twin bonds through O because that the simple reason that p will acquire a -1 fee which will certainly make the molecule very unstable.

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

PO43- Hybridization


Let us currently take a look at the Hybridization that the molecule i m sorry will give us an ext information ~ above the nature of your chemical bonds.

The Hybridization that PO43- is Sp3.

This have the right to be construed through two methods:-

Method 1: The concept aspect- Hybridization of PO43- have the right to be discovered by adding the variety of bonds and the lone pair that the main 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 the sp3 hybridized.

H=5 means that it is sp3d hybridized.

And H=6 way that that is sp3d2 hybridized.

In PO43-, we understand P is the main atom. It provides 4 sigma bonds through each O atom (double bonds/triple bonds are considered as one sigma bond) and it has actually no lone pairs existing 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 advantageous if girlfriend don’t mental the theory.The formula to discover the Hybridization of any kind of molecule is offered below:-

H= 1/2

H= Hybridization the the molecule

V= number of Valence electron of the main atom.

C= charge on cation or much more electropositive atom.

A= charge on anion or an ext electropositive atom.

Now let us look in ~ PO43-,

Here p is the central atom so V =5 (valence electrons)

M= 0, due to the fact that Oxygen (O), is a divalent atom, so there space no monovalent atom bonded to the main atom.

C = 0 (charge ~ above P)

A= -3 (Combined charge of O atoms)



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

Hence, the hybridization the PO43- have the right to be discovered by making use of these 2 methods.

PO43- molecule Geometry

The next vital step is to recognize the molecular geometry the PO43-.

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

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

The notation AXN have the right to be offered to determine the molecular geometry of any type of molecule. A denotes the number of central atoms.

X denotes the variety of atoms that room chemically external inspection to the central atom. And finally, N denotes the lone pairs on the main atom ( the nonbonding electrons).

Looking at PO43-, A=1 due to the fact that P is the only main atom. X= 4 as there 4 atoms of O attached come the central atom. N will certainly be zero together all the electrons are involved in bonding and there space no lone pairs. Thus using the formula, we obtain the form for PO43- together AX4.

If us look increase this notation in the VSEPR chart given listed below we find that PO43- has actually a tetrahedral shape.


PO43- Polarity

PO43- is a non-polar molecule.

Electronegativity difference is the main factor as result of which polarity occurs in a molecule. Polar molecules usually have actually an asymmetrical shape and their network dipole minute is never zero.

The electronegativity difference between P (2.1) and also O(3.5) is higher than 0.5 making the P-O link polar. But is PO43- together a molecule polar?

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

To check this fact, we can likewise take a look in ~ its molecular geometry. It has actually a tetrahedral shape with every dipole minute going in the opposite direction, making the net dipole moment 0 which renders PO43- a non-polar molecule.


The molar mass of PO43- is 94.97 g/mol. That is extensively used in toothpaste together polishing and also a air conditioning agent. That is also used in various cleaning agents and also pesticides also making it quite beneficial for acquiring rid of dirt.

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So now, we have learned whatever we need to know around the PO43- molecule varying from that is Lewis structure, hybridization, molecular geometry, and polarity.

Now you have actually strengthened your basics for the molecule P043-. If girlfriend have any type of doubts about the above-mentioned points you re welcome feel free to address me. Examine Well!