In making the Fe-bipy \" unknown \" solution from your Fe-oxalate product for th

Question

In making the Fe-bipy "unknown" solution from your Fe-oxalate product for the spectrophotometry experiment, you realize that your "unknown" solution is only very faintly reddish when compared to the much redder solution of Fe-bipy "known" standard solution. What could you have done wrong?

You forgot to add the ascorbic acid to your diluted "unknown" solution

You didn't add enough buffer to your diluted "unknown" solution

You failed to dilute your standard solution before adding the ascorbic acid, buffer, and bipy

You failed to precipitate away all of the C2O42– in the previous step

All of the above

You forgot to add the ascorbic acid to your diluted "unknown" solution

You didn't add enough buffer to your diluted "unknown" solution

You failed to dilute your standard solution before adding the ascorbic acid, buffer, and bipy

You failed to precipitate away all of the C2O42– in the previous step

All of the above

Explanation / Answer

Vitamin C is used to reduce Fe(III) to Fe(II) in a near neutral solution which is the coloured complex with oxalate. As these two are A and B. I would say E all of the above according to the combinations.

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