Basically, I'm trying to find the molarity of a titrant sodium thiosulfate solution (containing NaOH and Na2S2O3) through standardization in which a mixture of H2SO4 and the potassium iodide-iodate solution, along with starch indicator, are involved.

The setup of equations is giving some difficulty. Can anyone direct me, or give me hints, on how to write out the equations involved, so I can eventually find the molarity?

Thanks for any help.