Write a half-reaction for the oxidation of the manganese in mnco3(s) to mno2(s) in neutral groundwater where the carbonate-containing species in the product is hco3–(aq). add h2o and h+ to balance the h and o atoms in the equation. do not add electrons; you may leave the half-reaction unbalanced with respect to charge

The half-reaction for the oxidation of the manganese in to .:

Explanation:

Let us say the medium in which reaction is taking place is an acidic medium. And balancing in an acidic mediums done as;

Step 1: Balance all the atom beside oxygen and hydrogen atom;

Manganese and carbon are balanced.

Step 2: Balance oxygen atom adding water on the required side:

Step 3: Now balance hydrogen atom by adding hydrogen ion on the required side:

a corroding iron, if that's one of your choices