Question

Eriochrome black t indicator water hardness

Answer 1

Eriochrome Black T. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, e.g. in the water hardness determination process. It is an azo dye.