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In the lab(titrations based on complex formation), we determined the magnesium by direct titration using EDTA...

In the lab(titrations based on complex formation), we determined the magnesium by direct titration using EDTA and determined the calcium by displacement and back titration. I know you cant use back or displacement titration using EDTA to determine Mg concentration. However can you do back or displacement titrations using another reagent to determine Mg concenteation?

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Many metal ions react with electron pair donors to form coordination compounds or complex ions. The formation of a particular class of coordination compounds, called chelates, are especially well suited for quantitative methods. A chelate is formed when a metal ion coordinates with two (or more) donor groups of a single ligand. Tertiary amine compounds such as ethylenadiaminetetraacetic acid (EDTA) are widely used for the formation of chelates. Complexometric titrations with EDTA have been reported for the analysis of nearly all metal ions.

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