Given the following redox equation in basic medium Br2 + Mn2+ ------> MnO2 + Br - Find the sum of coefficients of the balanced equation.

Answer 1

We will have to balance this redox is basic medium.

Br₂ ==> Br- ... reduction half reaction

Br₂ + 2e- ==> 2Br^- balance reduction half reaction

Mn²⁺ ==> MnO₂ ... oxidation half reaction

Mn²⁺ + 2H₂O ==> MnO₂ ... balanced for O

Mn²⁺ + 2H₂O + 4OH^- ==> MnO₂ + 4H₂O ... balanced for H using basic medium

Mn²⁺ + 2H₂O + 4OH^- ==> MnO₂ + 4H₂O + 2e- ... balanced for charge and final balanced oxidation reaction

Add the two equations together and combine/cancel like terms to get...

Br₂ + Mn²⁺ + 4OH^- ==> 2Br^- + MnO₂ + 2H₂O ... balanced redox equation

SUM OF COEFFICIENTS = 1 + 1 + 4 + 2 + 1 + 2 = 11