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Standard enthalpy of formation needed for EDTA metal complexes

by Gollegun
Tags: edta, enthalpy, formation, metal, standard
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Gollegun
#1
Aug12-14, 02:01 AM
P: 2
Hi,

I am trying to solve the chemical equilibria in a kraft mill bleach plant to predict mineral scale deposits. I am using the van't Hoff equation to account for temperature dependence of the formation constants, but I need the enthalpy of reaction for all equilibria and I am missing some data.

What I am missing is data for EDTA complexes with Na+ and K+. I have the std enthalpy of formation for EDTA, Na+ and K+ but in order to get the enthalpy of reaction I also need EDTA-Na and EDTA-K.

Does anyone know where I can find these values?

Kind regards

Gollegun
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Borek
#2
Aug12-14, 03:29 AM
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Formation constants for EDTANa and EDTAK are quite small from what I remember - are you sure they play any important role in the system?
Gollegun
#3
Aug12-14, 03:48 AM
P: 2
Quote Quote by Borek View Post
Formation constants for EDTANa and EDTAK are quite small from what I remember - are you sure they play any important role in the system?
I just automatically included all the ions of significant concentration. But you are right, the formation constants of Na and K are very low in comparison to other metals such as Ca and Mg - and they can probably be neglected. I'll try this and see how it works out.

Thanks!


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