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A confirmatory test for iron(iii) is Potassium Ferrocyanide.
The addition of potassium thiocyanate to Fe3+ produces a reddish-brown color due to the formation of this complex. The formation of the reddish-brown color confirms the presence of Fe3+.
The solution should be acidic for this test
A confirmatory test for nickel(ii) is dimethylglyoxime reagent (DMG).
Adding 2 or 3 drops of dimethylglyoxime reagent (DMG) to nickel(ii) will produce a rose-red precipitate of Ni(DMG)2 should form.
The solution should be basic for this test.
What is the confirmatory test for Fe3+?
Fe3+ forms a complex with thiocyanate, SCN−. The addition of potassium thiocyanate to Fe3+ produces a reddish-brown color due to the formation of this complex. The formation of the reddish-brown color confirms the presence of Fe3+.
What is the confirmatory test for Ni2+?
Add dimethylglyoxime(DMG) to the nickel ion solution. Next, add a little bit of ammonia to make the solution basic. It will give a red precipitate. This confirms the presence of Ni2+.
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