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Stevie is studying a solution of bleach containing 5.0% w/w NaOCl. She reacts a sample of the bleach solution with iodide, I−, under acidic conditions and then titrates the resulting iodine, I2, with sodium thiosulfate, Na2S2O3.
The titration requires 1.31 mL of 0.10 M sodium thiosulfate. What is the mass of the bleach solution sample?