Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: danshi2000 on August 28, 2017, 06:46:37 PM
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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)?
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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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It is a rule of thumb at best, just like the classification of the bonds.
Alright, that's what I thought. Thank you, Borek!