Question

Complete and balance the following redox equation using the smallest whole number coefficients. What is the...

Complete and balance the following redox equation using the smallest whole number coefficients. What is the coefficient of I2 in the balanced equation?

MnO4-(aq) + I- -->  Mn2+ + I2 (acidic solution)

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Homework Answers

Answer #1

Write reduction and oxidation half

Reduction half

MnO4-(aq) --- > Mn2+ (aq)

Oxidation half

I- --- > I2

Now balance the elements other than O and H

MnO4-(aq) --- > Mn2+ (aq)

2I- --- > I2

Balance O and H

MnO4- + 8H+ --- > Mn2+ + 4H2O

2I- --- > I2

Balance charge and electrons.

2 x (MnO4- + 8H+ + 5e- --- > Mn2+ + 4H2O )

5 x ( 2I- --- > I2 +2e- )

2MnO4- + 16H+ + 10 e- --- > 2Mn2+ + 8H2O

10I- --- > 5I2 + 10e-

----------------------------------------- ----

2MnO4- + 16H+ + 10I- --- > 2Mn2+ + 8H2O

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