Answer to Question #99353 in General Chemistry for lisa

Question

It is critical that the interactions holding together the Fe-indicator complex are significantly weaker than those holding together the Fe-EDTA- complex. What would be the consequence if an indicator was chosen that forms a stronger complex with the Fe3+ than the FeEDTA- complex? (5 pts)

Answer 1

If the indicator chosen forms a stronger complex with Fe3+ than the FeEDTA complex, then binding between Fe3+ and indicator is stronger than that of FeEDTA. EDTA become less reactive with Fe3+. The Fe3+ and indicator form colour complex.