Titration of I 2 produced from 0.1500 g of primary-standard-grade KIO 3 required 42.30 mL of sodium thiosulfate IO 3 - + 5 I - + 6 H + →  3 I 2 + 3 H  2O I 2 + 2 S 2O 3  2- →  2 I  - + S 4O  6  2- Calculate the concentration of the Na 2S  2O 3.

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Titration of I 2 produced from 0.1500 g of primary-standard-grade KIO 3 required 42.30 mL of sodium thiosulfate
IO 3 - + 5 I - + 6 H + →  3 I 2 + 3 H  2O
2 + 2 S 23  2- →  2 I  - + S 4O  6  2-
Calculate the concentration of the Na 2S  23.
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