Fireworks contain KClO 3 . To analyze a sample for the amount of KClO 3 a chemist

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Fireworks contain KClO3. To analyze a sample for the amount of KClO3 a chemist first reacts the sample with excess iron(II),ClO3(aq) + 6 Fe2+ (aq) + 6 H3O+ (aq) - Cl(aq) + 9 HO(l) + 6 Fe+ (aq)

and then titrates the resulting solution with Ce4+ [in the form of (NH4)2Ce(NO3)6]Fe+ (aq) + Ce+ (aq)  Fe+ (aq) + Ce+ (aq)

to determine the quantity of iron(II) that did not react with ClO3−. (This is referred to as a “back titration.”) Suppose a 0.1342-g sample of a firework was treated with 50.00 mL of 0.0960 M Fe2+. The unreacted Fe2+ ions then required 12.99 mL of 0.08362 M Ce4+. What is the weight percent of KClO3 in the original sample?

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Chemistry And Chemical Reactivity

ISBN: 9780357001172

10th Edition

Authors: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

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