Answer to Question #159571 in General Chemistry for Lowie

Question

Balance the reaction in both in acid solution and in basic solution.

MnO4

-

(aq) + NO2

-

(aq) → Mn2+

(aq) + NO3

-

(aq)

Answer 1

MnO₄^- + NO₂^- = Mn²⁺ + NO₃^-

MnO₄^- +8H⁺ = Mn²⁺ + 4H₂O + 5e^- x2

NO₂^- + H₂O + 2e^- = NO₃^- + 2H⁺ x5

2MnO₄^- +16H⁺ =2Mn²⁺ + 8H₂O + 10e^-

5NO₂^- + 5H₂O + 10e^- =5 NO₃^- + 10H⁺

2MnO₄^- +6H⁺ + 5NO₂^- =2Mn²⁺ + 3H₂O +5NO₃^-