The question is that Iron can be determined spectrophotometrically after reactio

Question

The question is that Iron can be determined spectrophotometrically after reaction with a ligand that results in a highly colored complex. In one determination, iron is reduced with hydroquinone to ensure it is all in Fe2+ oxidation state. Then, o-phenanthroline is added to complex it with the Fe2+. The reagents necessary to perform this experiment include a solution of hydroquinone, citric acid buffer, a solution of o-phenanthroline, and an Fe(NH4)2(SO)4 x 6H2O solution. The concentrations of which of these solutions must be known precisely in order to make an accurate determination of iron in an unknown sample. Explain your rationale

Explanation / Answer

When metal forms complex compounds different oxidation state of metal produces different coloured compound...

Fe2+ oxidation state of iron has green colored compouds

Fe3+ oxidation state has brownish red colored compounds...

so,

In pectrophotometry we determine the color of compounds...

So, from the color of complex formed we can determine oxidation state of iron in that compound..

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