Question

Why is pH 10 buffer used in EDTA titration?

Answer 1

EDTA:

1. EDTA (Ethylenediaminetetraacetic acid) is a complexometric indicator made up of two amino groups and four Lewis bases (carboxyl groups).
2. Because of its ability to signify six pairs of lonely electrons owing to the creation of covalent bonds, Edta is a hexadentate ligand.

Buffer:

1. In EDTA titration, pH 10 buffer is employed because Y^4- is prevalent in EDTA, and Y4- is needed to react with the metal ions present in the titration solution.
2. A pH 10 buffer can be used to achieve this.

Hence, pH 10 buffer is used in EDTA titration.