【Daily Question】Chemical Analysis Version, 11.8.2021
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The reason for adding a buffer solution in complexometric titration is A. The chelating ability of EDTA is related to acidity; B. Metal indicators have a specific range of acidity within which they can be used; C. H+ ions are released during the reaction between EDTA and metal ions; D. K’MY changes as acidity varies. C
C? However, I feel that complexometric titration has requirements regarding pH; the pH required for the complexation of different elements with EDAT varies, and buffer solutions can help keep the pH of the measurement system relatively stable throughout the process. There is still room for debate regarding this question; moreover, disodium ethylenediaminetetraacetate does not release hydrogen ions when reacting with metal ions……
C. H is released during the reaction between EDTA and metal ions+