Question

Write a balenced half-equation for the oxidation of maganese ion (Mn^2+) to solid maganese dioxide (MnO2 in acidic aqueous solution? Write with physical states.

Answer 1

Answer: Mn2+(aq)→MnO2(s)

Explanation: Balancing O in an aqueous medium, we get: Mn2+(aq)+2H2O(l)→MnO2(s)

Balancing H in an acidic medium, we get: Mn2(aq)+2H2O(l)→MnO2(s)+4H+(aq)

Balancing charge, we get: Mn2+(aq)+2H2O(l)→MnO2(s)+4H+(aq)+2e−