Titration of the I2 produced from 0.1142 g of primary-standard KIO3 required 27.95 mL of sodium thiosulfate.
IO3- + 5I- + 6H+ → 3I2 + 3H2O
I2 + 2S2O32- → 2I- + S4O62-
Calculate the concentration of the Na2S2O3.
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