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    Standardization of Na2S2O3

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    Added 0.12 g KIO3 and dissolved in 75 mL of distilled water. Added .20 g of KI to solution, then added 10 mL of 1M HCl and immediately titrated with thiosulfate solution (made by weighed 25 g of Na2S2O3-5H20 and .1 g of Na2C3 in 1 L of H20 that has been boiling for at least 5 minutes, then cooled solution)added 5 mlo of starch when became yellow, became blue, titrated until blue disappears.
    Took 20.52 mL of thiosulfate solution for solution to become clear - what is the molarity of the Na2S2O3?

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    https://brainmass.com/chemistry/physical-chemistry/standardization-na2s2o3-362667

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    Standardization of Na2S2O3
    Added 0.12 g KIO3 and dissolved in 75 mL of distilled water. Added .20 g of KI to solution, then added 10 mL of 1M HCl and immediately titrated with thiosulfate solution (made by weighed 25 g of Na2S2O3-5H20 and .1 g of Na2C3 in 1 L of H20 that has been boiling for at least 5 minutes, then cooled ...

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    The expert examines standardization of Na2S2O3.

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