predicting hybrids

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predicting hybrids

Postby josephyim1L » Tue Nov 20, 2018 11:56 pm

What's the easiest way to predict the type of hybrid orbital while predicting the molecular shape?

Iris Bai 2K
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Re: predicting hybrids

Postby Iris Bai 2K » Wed Nov 21, 2018 12:07 am

The number of bonded pairs in the molecule is the same as the number of orbitals in the hybridized orbital. For example, if there are 3 bonded pairs, then the hybridization is sp2. If there are 4, then it's sp3, and so on.

Emmaraf 1K
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Re: predicting hybrids

Postby Emmaraf 1K » Wed Nov 21, 2018 9:52 am

You can only figure out VSEPR structure by knowing the hybridization type since hybridizations just tell you the numbers of regions of electron density. d2sp3 is octahedral, dsp3 is trigonal bipyramidal, sp3 is tetrahedral, sp2 is trigonal planar, and sp is linear. To get molecular geometry, you need to know the number of lone pairs such as to differentiate a tetrahedral structure from a trigonal pyramidal structure.

Sophia Ding 1B
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Joined: Fri Sep 28, 2018 12:16 am

Re: predicting hybrids

Postby Sophia Ding 1B » Wed Nov 21, 2018 10:33 am

For simplicity's sake, I usually do what Iris does. But you also have to take into consideration of the lone pairs, so if you had for instance 2 bonded pairs and a lone pair, that would still be sp2. This way you can also predict molecular shape, as with my example of 2 bonded and 1 lone pair, it's 3 regions of electron density to identify as the shape trigonal planar.

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