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Na₂O₂ + 2 H⁺ + 2e ---> 2 Na⁺ + 2 OH⁻ /*3
[Cr(OH)₄]⁻ + 4 OH⁻ - 3e ---> CrO₄²⁻ + 4 H₂O /*2
3 Na₂O₂ + 6 H⁺ + 2 [Cr(OH)₄]⁻ + 8 OH⁻ ---> 6 Na⁺ + 6 OH⁻ + 2 CrO₄²⁻ + 8 H₂O
3 Na₂O₂ + 6 H₂O + 2 [Cr(OH)₄]⁻ + 2 OH⁻ ---> 6 Na⁺ + 6 OH⁻ + 2 CrO₄²⁻ + 8 H₂O
3 Na₂O₂ + 2 [Cr(OH)₄]⁻ ---> 6 Na⁺ + 4 OH⁻ + 2 CrO₄²⁻ + 2 H₂O
2 [Cr(OH)₄]⁻ + 3 Na₂O₂ ---> 2 CrO₄²⁻ + 4 OH⁻ + 6 Na⁺ + 2 H₂O