How do I calculate the moles of S2O3^2- used in the titration?

M

Meg

New member
10 cm3 of a brand of bleach was pipetted into a 250 cm3 volumetric flask and made up to the mark using distilled water.

25 cm3 of that bleach solution was pipetted into a conical flask. 10 cm3 of KI was added and 15 cm3 of H2SO4 was added.

It was titrated with Na2S2O3 in a burette.

The average volume of Na2S2O3 used was 26.21 cm3.
 
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