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Sagot :
The carboxyl groups in the interaction of EDTA4 with the acid shown below are shown red. In order to prevent EDTA from chelating with metal ions, protonation causes H atoms (seen as blue) to form a connection with the carboxyl groups' negatively charged O atoms. As a result, EDTA won't produce any coordination compounds.
In an acidic environment, EDTA4- forms as H4EDTA (ethylene-diamine-tetra-acetic acid), losing the ability to coordinate -COOH groups (COO- becomes -COOH), making it unable to chelate with metal ions.
As a result, no coordination compounds are created. This causes the number of Lewis base sites to drop to two (two N-atoms), and it also causes zwitterion ion production, in which the proton on the acid groups migrates to N and changes -COOH into -COO- and N into N+ while maintaining net neutral charge.
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