Question

Analysis of bleach involves two sequential redox reactions: First, bleach is reacted in acid solution with excess iodide anion to produce yellow-colored iodine A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 57.0 g, was diluted with an acetic acid solution containing excess I". A small amount of starch indicator solution was then added, turning the solution a deep bluish-purple. The solution was then titrated with 0.470 M sodium thiosulfate, Na2S203, containing the ion S203.A volume of 40.0 mL of sodium thiosulfate, the itrant, was needed to turn the solution colorless. Then, to determine how much of the iodine was formed the solution is titrated with sodium thiosulfate solution: PartA I2 2S2032 S4062 What is the percentage composition by mass of NaCIO in the bleach product? Express your answer to three significant figures and include the appropriate units. A bit of starch is added to the titration reaction. Starch is intensely blue in the presence of I2. The solution thus turns from deep blue to colorless at the reaction equivalence point. View Available Hint(s) 0.5 %NaClO

Answer 1