Did you know that the skeleton in our body damage majorly of phosphate ions (tricalcium phosphate)? It’s no only existing in our bones but even in our this as well. The sounds fairly interesting, right?

It’s not only important for humans but for plants as well. Therefore it’s important we learn about this compound and see what provides it for this reason special.

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

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

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

PO43- Lewis Structure

Before we start to attract the Lewis structure of PO43- step by action let us look at review of just how the Lewis structure will look at like.

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

The as whole charge top top the phosphate ion is -3 and the phosphorus atom is in an oxidation state that +5.

In the Lewis structure of PO43-, p forms solitary bonds through 3 oxygen atoms and also forms a twin bond through one oxygen atom. These oxygen atoms bring a charge of -1.

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

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

2. Locating the central atom that the molecule.

3. Arranging the electrons as lone bag to kind bonds v each atom.

4. Setup of the staying valence electrons so that each atom completes that is octet.

5. Convert potential lone bag into dual or triple bond to make the molecule an ext stable. We additionally check the formal fee of every atom and also make sure that the is the lowest possible.


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

Steps of illustration lewis structure of PO43-

1. Let united state count the total number of valence electrons because that 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 electron (4 atoms of O).

Now over there is a charge of -3 on the totality atom which means there room 3 additional valence electron present. Hence, total variety of valence electron is 5+24+3= 32 valence electrons.

2. The atom which has the greatest valence factor, as well as the greatest bonding sites, is termed as the main atom. Adhering to this thinking P is the central atom that PO43-.

3. Currently we start arranging these electrons together lone bag on each atom so the it resembles a chemical bond. 8 valence electron are provided up for this.

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

5. Now we examine the formal fee of every atom the PO43-. We check out 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 lowest formal charge possible? Remember that the dues on each atom of a molecule do it much more unstable. For this reason the best Lewis structure should ideally have each atom through a charge of 0 top top it.

In PO43-, P have the right to hold more than 8 valence electrons (period 5). So, if P makes a dual bond with among the oxygen atoms then p will have a fee of 0 and so will the doubly bonded O atom. The remainder 3 O atoms will have a -1 charge, thus providing rise to the -3 fee on the molecule.

We cannot induce more dual bonds with O because that the straightforward reason that p will gain a -1 charge which will certainly make the molecule extremely unstable.

Thus, we get the required ideal Lewis framework for PO43-.

PO43- Hybridization


Let us currently take a look in ~ the Hybridization the the molecule i m sorry will provide us much more information ~ above the nature of their chemical bonds.

The Hybridization that PO43- is Sp3.

This deserve to be understood through 2 methods:-

Method 1: The concept aspect- Hybridization the PO43- can be discovered by adding the number of bonds and also the lone pair of the central atom. The value of Hybridization (H) is determined by:-

If H=2 then it’s sp hybridized.

If H=3, climate its sp2 hybridized.

H=4 way that its sp3 hybridized.

H=5 method that it is sp3d hybridized.

And H=6 way that that sp3d2 hybridized.

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

Method 2: Next we involved the formula facet of hybridization. This is useful if you don’t psychic the theory.The formula to discover the Hybridization of any molecule is provided below:-

H= 1/2

H= Hybridization of the molecule

V= variety of Valence electrons of the main atom.

C= fee on cation or more electropositive atom.

A= fee on anion or more electropositive atom.

Now let us look in ~ PO43-,

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

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

C = 0 (charge on P)

A= -3 (Combined fee of O atoms)



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

Hence, the hybridization that PO43- can be discovered by using these 2 methods.

PO43- molecule Geometry

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

The molecule geometry of a molecule provides its shape as well as the shortcut angles.

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

The notation AXN have the right to be supplied to recognize the molecular geometry of any molecule. A denotes the number of central atoms.

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

Looking in ~ PO43-, A=1 because P is the only main atom. X= 4 together there 4 atoms of O attached come the main atom. N will be zero as all the electron are connected in bonding and there room no lone pairs. For this reason using the formula, we gain the form for PO43- as AX4.

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


PO43- Polarity

PO43- is a non-polar molecule.

Electronegativity distinction is the main factor due to which polarity occurs in a molecule. Polar molecule usually have actually an asymmetrical shape and their network dipole moment is never zero.

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

For that, we very first draw its Lewis structure and then draw the dipole moments because that each bond. Because of PO43- having actually a symmetry structure, the dipole moments cancel each other out rendering the molecule non-polar.

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


The molar fixed of PO43- is 94.97 g/mol. That is extensively used in toothpaste as polishing and a conditioning agent. The is additionally used in miscellaneous cleaning agents and pesticides too making it quite beneficial for acquiring rid that dirt.

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So now, we have learned every little thing we have to know about the PO43- molecule varying from its Lewis structure, hybridization, molecular geometry, and polarity.

Now you have strengthened your basics because that the molecule P043-. If you have any kind of doubts concerning the above-mentioned points you re welcome feel complimentary to attend to me. Examine Well!