SO42- is a chemistry formula because that Sulfate ion; it comprises one Sulfur Atom and also four oxygen atoms. It also has a -2 charge due to the fact that of the extr electrons the accepts to attain this structure. This blog post will aid you understand if this ion is polar or nonpolar, although a -2 charge can confuse you. It is far better to know the polarity by the Lewis Structure, Shape and Net Dipole moment of the molecule.

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What is polarity?

When we talk around polarity, it is usually a phenomenon due to the separation of electrical charges in the given molecule, which leader to an electrical dipole in the molecule. Polar molecules consist of polar bonds, and also that is because of a difference in electronegativity between the atoms creating bonds. However, polarity likewise depends top top the shape of the molecule and also the lone pairs.

SO42- Lewis Structure and also Shape

If friend look at the Lewis Structure the SO42- ion, the is quite simple. The sulfur atom is in the centre, forming double bonds with two Oxygen atoms and single bonds with the remaining two Oxygen atoms. The form of the molecule is tetrahedral, and it is quite symmetric as well. As well as that, the negative charges are because of the single bonds with Oxygen atoms.


As mentioned above, lone pairs additionally contribute to the molecule’s polarity; there space no lone pairs of electrons on the main Sulfur atom.

Electronegativity and also Bond Nature

Once you understand the shape and other details the the molecule, the is crucial to uncover out the shortcut nature in the molecule. Sulfur’s electronegativity value is 2.6, and for Oxygen, the is 3.44; therefore when you calculate the difference in electronegativities, it is greater than 0.4. 


As the distinction is greater than 0.4, the bonds in between Sulfur and also Oxygen are polar. Meaning there will be a dipole moment in the direction the the Oxygen atom.

Net Dipole moment in SO42-

The bonds in this molecule room polar, and therefore there will be a dipole minute from Sulfur come Oxygen atoms. However, if girlfriend look at its shape, all the Oxygen atoms room arranged as far as possible, which leader to nullifying every other’s dipole moment. Such plan cancels the opposite dipoles, leading to a zero network dipole moment.

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Thus, SO42- is a nonpolar ion.

Why is SO42- taken into consideration a nonpolar ion?

A lot of of world don’t believe that this molecule is nonpolar as it can dissolve in polar solvents. It have the right to dissolve in polar solvents because of the an unfavorable charges existing on the two Oxygen atoms. There are no poles created in this molecule as the net dipole moment in the molecule is zero as result of the setup of Oxygen atoms. So although over there is no polarity in the molecule, it can dissolve in polar solvents. 

Concluding Remarks

The sulfate ion or SO42- is nonpolar since there is zero network dipole in the molecule. The symmetric setup of Oxygen atom nullifies the dipole moment in the molecule, which makes it a nonpolar ion. I hope this blog article helps you recognize the polarity the Sulfate ion v ease.