[Bazinga11]

The question says to balance this reaction:
MnO4 (1-) + I2 + H(1+) --> MnO2 + I03 (1-)

I this is in a base but I have never seen an H+ on the left side before...

I balanced it without using that H and it seems to have balanced:

2H20 + 10 Mn04 (1-) + 3I2 --> 6IO3 (1-) + 10 MnO2 + 4OH(1-)

That is balanced correctly right? What is the a on the reactant side for?

Thank you

[Big-Daddy]

Indicate which O/0s are oxygen atoms and which are actually 0...

[Bazinga11]

Sorry I put a space between the 10's. I am not sure if this is a basic or acidic reaction,  does the H ion indicate that it is acidic?

[Hunter2]

H⁺ means its acidic. But your solution is right, because under acidic conditions the reaction will not stop at MnO₂. It will form Mn²⁺.