32 mL of an aqueous solution of iodine
is titrated with 0.042 M Na2S2O3(aq), with
starch as the indicator:
I2(aq) + 2 S2O2−
3 (aq) −!
2 I−(aq) + S4O2−
The blue color of the starch-iodine complex
disappears when 34.65 mL of the thiosulfate
solution had been added. What is the molar
concentration of I2 in the original solution?
Answer in units of mol/L.
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