The production of sodium periodate is very simple. You need tincture of iodine and sodium hypochlorite. Add the sodium hypochlorite to the tincture of iodine. The triiodide ion is oxidized to hypoiodite, whichly quickly oxidizes to iodate, then gradually to periodate: I3(-) + 9 ClO(-) -> 3 IO3(-) + 9 Cl(-) IO3(-) + ClO(-) -> IO4(-) Sodium periodate is sparingly soluble and crystallizes out as colorless crystals after a few minutes. Here is the sodium periodate. The tincture of iodine coloration has completely disappeared.