Why is complexometric titration of multiply charged metal ions carried out in an acidic medium

Why is complexometric titration of multiply charged metal ions carried out in an acidic medium, and alkaline-earth titrations in an alkaline one?

Complexometric titration of multiply charged metal ions can be carried out in an acidic medium, since the stability constants of their complexonates are high and the proportion of the reactive part of complexone III (a4) is sufficient for the formation of a complex. The titration of alkaline earth metals is carried out only in an alkaline medium, since in an acidic medium, due to the low strength of the complexonate and a significant decrease in the proportion of the reactive part of the complexone III, the complexonates are not formed.

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