b) Balance O atoms by adding H2O molecules.
Cr2O72- 2 Cr3+ + 7 H2O
c) Balance H atoms by adding H+ ions.
14 H+ + Cr2O72- 2 Cr3+ + 7 H2O
d) Balance charge by adding electrons.
6 e- + 14 H+ + Cr2O72- 2 Cr3+ + 7 H2O
For the I -/I2 reaction:
a) Balance atoms other than O and H.
2 I - I2
Balancing Redox Equations in Acid
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