[LeFowl]

We did a lab testing on iron 2+ ions and this is what we did
FeCl2(aq)  + KMnO4(aq)---->?
we have to find out whats the reaction can someone help me???

[Astrokel]

KMnO₄ is a strong oxidizing agent and able to oxidize Fe²⁺ to Fe³⁺. What condition did you carried out this reaction?

[LeFowl]

KMnO₄ is a strong oxidizing agent and able to oxidize Fe²⁺ to Fe³⁺. What condition did you carried out this reaction?

all we ever told was that FeCl2 in dilute HCl was added to KMnO4 in water and if the KMnO4 was decolourized (which it was)that it is Fe2+ was added and not Fe3+

[Donaldson Tan]

Wow.. as long as you don't add too much aq. KMnO₄ into your test solution, you will observe a colour change from green to yellow as Fe²⁺ oxides to Fe³⁺. If you add excess aq. KMnO₄, your entire test solution will just turn purple. I will provide you with 2 redox equations. You do the balancing yourself to arrive at the final chemical equation:

Assuming acidic conditions,
1) Fe²⁺ -> Fe³⁺ + e^-
2) MnO₄^-  + 8H⁺ + 5e^- -> Mn²⁺ + 4H₂O

(If you use alkali aq. KMnO₄ instead of acidified aq. KMnO₄, you would observe a brown precipitate, ie. Fe(OH)₃, formed)