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The following method is reported in Standard Methods for the Examination of Water and Wastewater for the analysis of sodium hypochlorite (NaOCI) in bleach.

The following method is reported in Standard Methods for the Examination of Water and Wastewater for the analysis of sodium hypochlorite (NaOCI) in bleach. . a 20.00 mL sample of bleach is diluted to 100.0 mL. a 25.00 mL aliquot of the diluted sample is then transferred into a flask and treated with an excess acidic iodide solution. the iodine thus formed, is titrated with a standard thiosulfate solution. The chemistry is outlined below (unbalanced equations): Excess iodide is reacted with the analyte in an acidic solution. OCT + I + H CI+ 1 + HO The resulting iodine (1) is then titrated with a standardized solution of sodium thiosulfate. SO3 + 1 S40 + I If 12.62 mL of a 0.00400 N thiosulfate solution was required to reach the end point, what is the concentration of the original bleach solution as wt% and ppm as Cl?

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