Weigh 0.05 grams of dry potassium iodate (KIO3), dissolve it in a 250 ml Erlenmeyer flask with 50 ml of aqua distillate, stir until homogeneous. Then add 10 ml of 20% potassium iodide and 2.5 ml of 4 N HCl, then titrate with 0.1 N sodium thiosulfate solution until the solution is yellow, add 2 ml of 1% starch solution and continue titrating until the blue color disappears.