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Unformatted text preview: Once the solution turned pale yellow, starch was added to the solution. The starch combined with the small amount of iodine remaining in the solution and turns the solution dark blue in color. More thiosulfate was added until the solution became clear. Initial buret volume (mL) Final buret volume (mL0 Difference between final and initial readings (mL) Average difference (mL) 0.3 11.5 11.2 13.3 11.5 26.2 14.7 26.2 40.3 14.1 The molarity of the thiosulfate solution was 0.1013M. It was given in the lab. # molesS 2 O 3 2-( aq ) = (0.0133 L )(0.1013 M ) = 0.00135 moles 0.00135 molesS 2 O 3 2-( aq ) x 1 molI 2 2 molS 2 O 3 2-x 1 molOCl-1 molI 2 x 1 10 mL titrand x 100 mL dil 10 mL x 1000 mL 1 L = 0.675 MOCl-Conclusion : The molarity of the hypochlorite ion in commercially available bleach (Clorox) was determined to be 0.675M....
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