\"The addition of KSCN to the unknown sample in Step 4 results in a red solution

Question

"The addition of KSCN to the unknown sample in Step 4 results in a red solution, but it is much paler than the color observed for the known sample. How should you proceed?" A)"A pale color indicates a weak test result. Since iron is a common contaminant, retest the unknown solution by adding KSCN to 0.5 mL of the original sample solution.

B)" "Start the procedure over from the beginning, it is the only way to be sure the solution isn't contaminated.

C)" "No further action required, the red color confirms the presence of Fe3+. "

Explanation / Answer

We dont know the step 4,

However the formation of Fe(SCN)2+ results in appearence of red colour. If concentration of Fe+3 is low then it may result in appearance of light red colour as compared to known sample.

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