Br^{-I} - 1 e^{-} → Br^{0}

Cr^{VI} + 3 e^{-} → Cr^{III}

1. | KBr + K_{2}Cr_{2}O_{7} + H_{2}SO_{4} → Br + _{2}Cr + _{2}(SO_{4})_{3}K + _{2}SO_{4}H_{2}O |

2. | KBr + K_{2}CrO_{7} + H_{2}SO_{4} → Br + _{2}Cr + _{2}(SO_{4})_{3}K + _{2}SO_{4}H_{2}O |