What is the ionic equation for reaction of potassium permanganate with potassium iodide?
How stable is $\ce{IO3-}$ in the presence of $\ce{I-}$ under acidic conditions? 

It would end up being in an equilibrium with very few $\ce{IO3-}$ anions and lots of iodine, due to the following equilibrium:

$$\ce{2 IO3- + 12 H3O+ + 10 I- &lt;=&gt; 6 I2 + 18 H2O}$$