Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00)

Question

Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a 500 mL volumetric flask. Then 50.00 mL of the solution was pipetted into a flask and treated with excess KI (2 g) and acid (10 mL of 0.5 M H2SO4). How many moles of I3- are created by the reaction? The triiodide from part (a) reacted with 37.51 mL of Na2S2O3 solution. What is the concentration of the Na2S2O3 solution? A 1.223 g sample of solid containing ascorbic acid and inert ingredients was dissolved in dilute H2SO4 and treated with 2 g of KI and 50.00 mL of KIO3 solution from part (a). Excess triiodide required 14.24 mL of Na2S2O3 solution from part (b). Find the weight percent of ascorbic acid (FM 176.13) in the unknown. Does it matter whether starch indicator is added at the beginning or near the end point in the titration in part (c)?

Explanation / Answer

Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00)

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