0.2500 g sample of swimming pool oxidizer containing calcium hypochlorite as the active ingredient was dissolved in 0.50 M H2SO4 containing KI. The liberated iodine required 38.2 mL of Na2S2O3. The titrant was standardized by titrating 101.3 mg K2Cr2O7 dissolved in acid with the action of excess KI, which required 17.4 mL of the Na2S2O3. Calculate the % Ca(OCl)2 in the sample.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions
Section4.9: Spectrophotometry
Problem 2.1ACP: Excess KI is added to a 100.0-mL sample of a soft drink that had been contaminated with bleach,...
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A 0.2500 g sample of swimming pool oxidizer containing calcium hypochlorite as the active ingredient was dissolved in 0.50 M H2SO4 containing KI. The liberated iodine required 38.2 mL of Na2S2O3. The titrant was standardized by titrating 101.3 mg K2Cr2O7 dissolved in acid with the action of excess KI, which required 17.4 mL of the Na2S2O3. Calculate the % Ca(OCl)2 in the sample.

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