MnO4+i__>mno2+i2 half cell method

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Solution

MnO4- + 4 H+ + 3e-= MnO2 + 2 H2O
2 I- = I2 + 2e-

2 MnO4- + 8 H+ + 6 I- = 2 MnO2 + 4 H2O + 3 I2

add 8 OH- on the left and on the right side

2 MnO4- + 6 I- + 4 H2O = 2 MnO2 + 3 I2 + 8 OH-

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