In an experiment to determine the concentration of a sodium thiosulphate, Na2​ S2​O3​ solution, Amina performed the foll

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In An Experiment To Determine The Concentration Of A Sodium Thiosulphate Na2 S2 O3 Solution Amina Performed The Foll 1 (195.6 KiB) Viewed 55 times

In an experiment to determine the concentration of a sodium thiosulphate, Na2​ S2​O3​ solution, Amina performed the following: - A standard solution was prepared by dissolving 0.7480 g of potassium iodate, KIO3​, in a 250.0 mL volumetric flask. - 27 mL of a stock solution of Na2​ S2​O3​ was diluted in a 150 mL volumetric flask. - 25.0 mL of diluted Na2​ S2​O3​ was titrated against KIO3​ solution, [and 20.8 mL of KIO3​ was required to reach the end-point. The equations for the titration are as follows: IO3−​+5I−+6H+→3I2​+3H2​OI2​+2 S2​O32−​→2I−→S4​O62−​​ (a) Calculate the mole ratio between iodate ions and thiosulphate ions. (3 marks)