Balanced net ionic equation?

Question

What is the balanced net ionic equation that illustrates the reaction between sodium bromate and bromide ions in an acidic medium yielding Br2 as the only halogen containing product?

Answer 1

2BrO3- + 12H+ + 10 e- >> Br2 + 6H2O
2 Br- >> Br2 + 2e-) x 5
2BrO3- + 12H+ + 10 Br- >> 6 Br2 + 6 H2O
Divide by 2
BrO3- + 6H+ + 5Br- >> 3 Br2 + 3H2O

Answer 2

This is a redox reaction. To balence such equation, you would be better to start from half reactions such as from the table of Standard Reduction Potential. Notice that the oxidation number of Br in BrO3(-) changes from +5 to 0, and that in Br(-) changes from -1 to 0.
BrO3(-) + 6H(+) + 5e- ==> 0.5 Br2 + 3H2O
5Br- ==> 2.5 Br2 + 5e-
Add these two together and cancel 5e-, we get:
5Br- + BrO3(-) + 6H+ ==> 3Br2 + 3H2O
This is the net ionic equation.