Preparation of potassium periodate
100 g KIO 3 ceramic bowl to dissolve in 250 ml 20% KOH. The thus resulting solution warmed to 70-80 ° C after adding 100 grams of powdered parts K 2 S 2 O 8 . After cessation of the reaction mixture simmer for 5-10 minutes and after cooling filter out potassium sulphate, which was created during the reaction. The filtrate neutralize with dilute sulfuric acid (1:5) at pH = 5-6 (pouring acid in small portions under continuous cooling). After cooling, the precipitate fell out several times decanted to remove sulphates, chlorides and iodate (verify barium and silver salts). White crystalline precipitate was collected and dry at 105-110 C.