The exact concentration of a Na2S2O3 standard solution was determined by using KIO3 stock solution. 0.2189 g of KIO3 (potassium iodate Mr = 214.00 g/mol) were diluted to 200 cm3. 25 cm3 samples were titrated (after addition of acid and KI, proper amount in excess). The average of the consumption was 15.47 cm3. What is the concentration of Na2S2O3 standard solution and the KIO3 solution?

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