Question

Using the oxidation number method, balance the following ionic equation for basic solution.

http://prntscr.com/1tcf8g

Answer 1

\[I^-+Ce ^{4+}\rightarrow IO _{3}^-+6Ce^{3+}\]

Answer 2

I believe the ratio is 6:1, therefore I came up with a coefficient of 6 for both Ce^4+ and Ce^3+, but I'm not sure where to go from there.

Answer 3

You're right. The following step requires the condition that the reaction is in basic solution. So, you'll have something like,
\[Ce^{+4}+1e^-\rightarrow Ce^{3+}\]\[6OH+I^-\rightarrow IO_3^-+3H_2O+6e^-\]