dipole moment of PO4 3-

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JennyCKim1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

dipole moment of PO4 3-

Postby JennyCKim1J » Fri Dec 08, 2017 8:26 am

My understanding is that there is no dipole moment for PO4 3- because of resonance and hybrid bond lengths are equal. Does this mean that there is no dipole moment for O3 as well?

If attached molecules are all same and there is resonance, can I say that there is always no dipole moment?

Hammad Khan 2B
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Joined: Fri Sep 29, 2017 7:07 am
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Re: dipole moment of PO4 3-

Postby Hammad Khan 2B » Fri Dec 08, 2017 9:13 am

Yes, I agree with you that PO4^-3 has no dipole moment has all the oxygens are pulling on the phosphorus thus making the dipoles cancel out. However, to truly understand whether there is a dipole moment, we need to draw the lewis structure of O3 where we get that the molecule in the middle has a lone pair thus it is in the bent shape which is notable for polar compounds. Thus, O3 is polar.

Draw the Lewis Structure and you can tell if it has polarity or not then where the dipoles are going.


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