Answer to Question #144101 in General Chemistry for Min gi Jang

Question

To find concentration of Fe2+, we use UV-vis.
Why we make Fe2+ to [Fe(Phen)3]2+ to use UV-vis ?

Fe2+의 농도를 알아내기 위해 UV-vis를 사용하는데, UV-vis를 사용하기 위해서 왜 Fe2+를 [Fe(Phen)3]2+로 만드나요?

Answer 1

Since the iron current in the water mainly exists as Fe3+, it is vital to, first of all, reduce Fe3+ to Fe2+. To achieve this process is by adding the reducing agent of Hydroxylamine. Therefore, an extra reducing agent is required to maintain iron in the +2 state since dissolved oxygen will re-oxidize Fe2+ to Fe3+.