Comments on: Chelate effect-chelation? http://www.chelationpower.com/edta-chelation/chelate-effect-chelation The Benefits Of Chelation Thu, 16 Jul 2009 01:35:59 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: Colin http://www.chelationpower.com/edta-chelation/chelate-effect-chelation/comment-page-1#comment-1195 Colin Fri, 19 Jun 2009 03:10:59 +0000 http://www.chelationpower.com/edta-chelation/chelate-effect-chelation#comment-1195 the phrase is .. Under conditions of equal copper concentrations and when the concentration of methylamine is twice the concentration of ethylenediamine, the concentration of the complex (1) will be greater than the concentration of the complex (2). put simply There are two experiments:[1] and [2] 1] Cu2+ concentation =x mol/L, MeNH2 conc = 2y mol/L 2] Also Cu2+ concentation =x moles/L, en conc = y mol/L Result, the conc of complex resulting in expt 2 is bigger than conc of complex in expt1. Why?: what this is actually says, is that the bidentate ligand, with 2 coordinate bonds, bonds more strongly to the Cu2+, despite being present in a lower concentration in expt2. This means the equilibria is much more to the right in expt2 and the [Cu(en)]2+ complex is much more stable than the methylamine one. Why is it confusing? NOT YOUR It is rather confusing what exactly is being referred to in each expt. I think it could have been worded and explained in an easier manner!<br><b>References : </b><br>retired Chemistry examiner the phrase is ..
Under conditions of equal copper concentrations and when the concentration of methylamine is twice the concentration of ethylenediamine, the concentration of the complex (1) will be greater than the concentration of the complex (2).

put simply

There are two experiments:[1] and [2]
1] Cu2+ concentation =x mol/L, MeNH2 conc = 2y mol/L
2] Also Cu2+ concentation =x moles/L, en conc = y mol/L

Result, the conc of complex resulting in expt 2 is bigger than conc of complex in expt1.

Why?: what this is actually says, is that the bidentate ligand, with 2 coordinate bonds, bonds more strongly to the Cu2+, despite being present in a lower concentration in expt2. This means the equilibria is much more to the right in expt2 and the [Cu(en)]2+ complex is much more stable than the methylamine one.

Why is it confusing? NOT YOUR It is rather confusing what exactly is being referred to in each expt. I think it could have been worded and explained in an easier manner!
References :
retired Chemistry examiner

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