Chemistry - please help! Thank you! 1. What is the balanced net ionic equation f

Question

Chemistry - please help! Thank you!

1. What is the balanced net ionic equation for the reaction in acidic solution of Fe^2+ and KMnO4 (Fe2+ becomes Fe3+ and MnO4 becomes Mn2+)

a)4Fe2+ + MnO4 + 8H+ 5Fe3+ + Mn2+ + 3H2O

b) 5Fe2+ + MnO4– 5Fe3+ + Mn2+

c)5Fe2+ + MnO4– + 8H+ 5Fe3+ + Mn2+ + 4H2O

d)3Fe2+ + MnO4 3Fe3+ + Mn2+ + H2O

2. What happens to the color of the Fe^2+ when the equivalence point is reached?

a) The color turns pink or purple.

b) The color remains the same.

c)The color turns green.

d) The color turns yellow or orange

Explanation / Answer

1) correct answer :

c) 5Fe2+ + MnO4– + 8H+ -------------> 5Fe3+ + Mn2+ + 4H2O

Explanation :

Oxidation : Fe+2    -----------------> Fe+3

Reduction : MnO4-   --------------> Mn+2

Oxidation half reaction : 5 Fe+2   --------------> 5 Fe+3   + 5 e-

Reduction half reaction : MnO4- + 8 H+    --------------> Mn+2 + 4 H2O + 5e-

net balanced equation :

5Fe2+ + MnO4– + 8H+ -------------> 5Fe3+ + Mn2+ + 4H2O

2)

c)The color turns green.

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