Is PF5 Polar Or Nonpolar

pf5 polarity

Before proceeding to our main topic, is PF5 polar or nonpolar, I want you first to understand PF5.

Phosphorus Pentafluoride (PF5) is a chemical compound that contained phosphorus in the oxidation state +5, +3, and +2.

It is phosphorus halides, which is a compound that phosphorus forms with a halogen. Phosphorus Pentafluoride (PF5) is a colorless, nonflammable, and poison gas with a pungent smell.

It is extremely irritating to the human body parts such as eyes, skin, etc. When PF5 is exposed to the water, corrosive fumes are generated, which may cause tissue damage and chemical burn.

Phosphorus Pentafluoride (PF5) is prepared using ASF3 ( phosphorus pentachloride reacts readily with water) by phosphorus pentachloride fluorination. It is essential phosphorus chlorides other than PCl3 and POCl3.

Formula:

The chemical formula of Phosphorus Pentafluoride is PF5.

Preparation:

It was prepared in 1876, which chemical reaction is given below.

3 PCl5 + 5 AsF3 → 3 PF5 + 5 AsCl3

Is PF5 Polar Or Nonpolar

Polarity of PF5
Phosphorus Pentafluoride (PF5)

Explanation 1:

The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because it is considered vertical and horizontal planes. To achieve a neural conformation, the electrons pull balance themselves. 

Explanation 2:

The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because the electronegativity of five fluorine chlorides bonds cancel out each other, which resulting PF5 is a nonpolar molecule. 

Explanation 3:

The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because the configuration of PF5 has trigonal bipyramidal, and PF5 consists of a central phosphorus atom, surrounded by five fluorine atoms. So the three planar fluorine’s electronegativity cancels out each other, which resulting PF5 is a nonpolar molecule.

Explanation 4:

The Phosphorus Pentafluoride (PF5) is a nonpolar molecule because the bond P-F is polar, and the F atom in PF5 has more electronegative than P. But the dipole of the P-F bonds cancels out each other, resulting in a zero net dipole moment. Therefore PF5 is a polar molecule.

Summary

Simple is that PF5 is a polar molecule because of the above reasons. Try to understand anyone in the above explanation to get your answer to why PF5 is a nonpolar molecule.

 Phosphorus Pentafluoride (PF5) Molecular Geometry

The molecular geometry of Phosphorus Pentafluoride (PF5) is triangular bipyramidal. In PF5 structure, the F atoms want to stay away from other F as possible, but check out the above image. Still, the F atom is bonded with the P atom.

There are a total of five F atoms, three of them lies on the (X-Y) plane which spaced equally and making the bond angle of 120degrees each other.

The other remaining two (F) lies on the positive and negative z-axis, which makes the bond angle of 90 degrees with each other.

Summary

The Phosphorus Pentafluoride (PF5) molecular geometry is triangular bipyramidal.

Lewis Structure Of PF5

Lewis Structure of PF5
Lewis Structure of Pentafluoride (PF5)

To draw the PF5 Lewis structure, follow the below instructions.

  • First of all, find out the total number of valence electrons in the PF5 using the periodic table.
  • The phosphorous is in group 5 and has five valence electrons. The fluorine is in group 7 and has seven valence electrons. But from PF5 formula it means that five fluorine so multiple 7(5) which becomes 35.
  • Now add P and F both valence electrons, P=5, F=35 so 5+35=40.
  • We have a total of 40 valence electrons.
  • Put the phosphorus in the center and add five fluorine around central atom P.
  • Connect the phosphorus to each fluorine (F) using a single line, which represents a pair of electron.
  • When you draw a single line on each fluorine, it means you have used 10 valence electrons, and 30 are still left.
  • Used the remaining 30 electrons to fill the octet, make sure that all the fluorine have eight valence electrons so their outer shell will be full.
  • The phosphorus in the center has 10 valence electrons, so you won’t worry about it because phosphorus is in the period of 3 in the periodic table and can hold more than eight valence electrons.

If you are weak theoretically than watch the video to understand the concept of PF5 Lewis structure practically.

Hybridization Of PF5

The Phosphorus Pentafluoride (PF5) has sp3 hybridization, because of its trigonal bipyramidal shape. 

You can also calculate hybridization by counting the bond and lone pair that give you the steric number.

In PF5 the phosphorus has 0 lone pair and 5 bond pair, which resulting steric number=5.

Once you find the steric number, It’s easy to find out hybridization, The steric number of PF5 is 5, which is equal to sp3 hybridization.

Summary

The hybridization of PF5 is sp3.

PF5 Electron Geometry

Three pairs of electrons (plane triangle). The basic geometric shape of a molecule containing a central atom with three pairs of electrons is a plane triangle.

The molecular geometry of PF5 is triangular bipyramidal, and electronic geometry of PF5 is the plane triangle.

Summary

Simple is that the electronic geometry of PF5 is plane triangle.

PF5 Dipole Moment

The dipole moment of PF5 is zero because PF5 is a nonpolar and forming covalent bond.

There is two axis of PF5 molecules where one of the axis form triangular shape and the other axis form a linear shape which resulting zero dipole moment.

In each P-F bond cancellation, the molecule carries the no dipole charge. The charge distribution is equal; therefore, there is no dipole moment.

The electronegativity of phosphorus (2.19) and fluorine (3.98) is different from each other. Since the polarity of the P-F bond becomes polar but due to the trigonal bipyramidal geometry, P-F bonds cancel out each other, which resulting no net dipole moment.

PF5 has five single bonds, and SF4 has four single bonds to the central atom.

Summary

Simple is that the PF5 dipole moment is zero.

Properties Of Phosphorus Pentafluoride (PF5)

  • The chemical formula of Phosphorus Pentafluoride is PF5.
  • The molar mass of PF5 is 125.966 g/mol.
  • Its gas is colorless and toxic in nature.
  • The odor of PF5 gas is very unpleasant.
  • The structure of PF5 has trigonal pyramidal.

Summary

Above are the few properties of PF5.

Uses Of Phosphorus Pentafluoride (PF5)

  • It is used as a polymerization catalyst.
  • It is the best source of phosphorus in semi-conductor.
  • Toxic gas and corrosive fumes are generated when PF5 expose in the water.
  • Prolonged exposure to fire or heat from the container may cause serious explosions and fires.
  • PF5 is used in the polymerization reactions as a catalyst.

Summary

Above are the uses of Phosphorus Pentafluoride (PF5)

Related Questions

Why does pf5 exist but not ph5?

PH5 is formed by hybridizing and overlapping the d orbital with Sp3d. F has higher electronegativity, so Sp3d hybridization is possible, but H has lower electronegativity and cannot form sp3d hybridization, and cannot form PH5.

Is pf5 possible?

The phosphorus and nitrogen both have 5 valence electrons, and they need 3 electrons to complete the octet. Therefore the phosphorus and nitrogen show the covalency of 3, and both PF3 and NF3 exist.

The phosphorus has empty 3 orbitals, and nitrogen does not have d orbitals so phosphorus can accept more electrons and can increase covalency to 5 to make PF5.

Final Thoughts

That was all about is PF5 polar or nonpolar, I hope it’s now clear to you that Phosphorus Pentafluoride (PF5) is a nonpolar molecule because F atom has more electronegativity than P atom.

The molecular geometry of PF5 is triangular bipyramidal. With the same and different plane at a different bond angle. 

The (X-Y) plane make the bond angle of 120 degrees and z-axis make the bond of 90 degrees.

To draw PF5 Lewis structure, watch the above video or follow the given instructions.

The PF5 has sp3 hybridization, and its electronic geometry is the plane triangle.

Phosphorus Pentafluoride (PF5) have zero dipole moment.

Do you think we have missed something about PF5 topic? Let us know in the comments section below we will add them.

Rate This Article!
Sending
User Review
0 (0 votes)

Leave a Reply

Your email address will not be published. Required fields are marked *