Question

The colour of the metal-EDTA

complex is ki​

Answer 1

blue

Metal EDTA complex are characterised by blue color of Patton and Reeder indicator in basic medium of pH 12. Therefore make the solution basic using sodium hydroxide solution, add a pinch of P&R indicator and add slowly EDTA solution. The color change from Red to Blue with indicate the complete chelation.

Answer 2

Metal EDTA complex are characterised by blue color of Patton and Reeder indicator in basic medium of pH 12.