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Topic: Polarity of CoCl_2  (Read 2080 times)

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Offline danshi2000

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Polarity of CoCl_2
« on: August 28, 2017, 06:46:37 PM »
I was doing an investigation concerning polarity, when I noticed something odd:

The bond between Co and Cl is defined as ionic because it links a metallic cation with a nonmetal anion. However, if we use the polarity "guidelines", the bond should be polar covalent because the electronegativity difference between Co (EN: 1.9) and Cl (EN:3.2) is 1.3, as defined by the Ib Chemistry Data Booklet, First Assesment 2016, Third Edition.

How accurate are the polarity guidelines (0=nonpolar covalent, 0.5-1.7 or 0.5-2.0= polar covalent, >2.0=ionic)?

Offline Borek

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Re: Polarity of CoCl_2
« Reply #1 on: August 29, 2017, 02:58:38 AM »
How accurate are the polarity guidelines (0=nonpolar covalent, 0.5-1.7 or 0.5-2.0= polar covalent, >2.0=ionic)?

It is a rule of thumb at best, just like the classification of the bonds.
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Offline danshi2000

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Re: Polarity of CoCl_2
« Reply #2 on: August 29, 2017, 03:54:17 AM »
It is a rule of thumb at best, just like the classification of the bonds.

Alright, that's what I thought. Thank you, Borek!

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