Analysis of bleach involves two sequential redox reactions: First, bleach is reacted in acid solution with excess iodide anion to produce yellow-colored iodine: CIO + 2H + 21-I2 + Cl+ H20 Constants Peniodic Table A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 68.0 g, was diluted with an acetic acid solution containing excess I. A small amount of starch indicator solution was then added turming the solution a deep bluish-purple. The solution was then titrated with 0.490 M sodium thiosulfate, Na,S,0. containing the ion S2O3. A volume of 45.0 mL of sodium thiosulfate, the titrant, was needed to turn the Then, to determine how much of the iodine was formed, the solution is titrated with sodium thiosulfate solution: solution colorless. 12 + 2S2O32--+21- + S4O,2- Percent composition To obtain percent composition by mass, use the equation given here: 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. x 100% percent composition = mass due to specific component total mass of the mixture Fart A 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. > View Available Hint(s) ? HA P Pearson 9 1122
Analysis of bleach involves two sequential redox reactions: First, bleach is reacted in acid solution with excess iodide anion to produce yellow-colored iodine: CIO + 2H + 21-I2 + Cl+ H20 Constants Peniodic Table A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 68.0 g, was diluted with an acetic acid solution containing excess I. A small amount of starch indicator solution was then added turming the solution a deep bluish-purple. The solution was then titrated with 0.490 M sodium thiosulfate, Na,S,0. containing the ion S2O3. A volume of 45.0 mL of sodium thiosulfate, the titrant, was needed to turn the Then, to determine how much of the iodine was formed, the solution is titrated with sodium thiosulfate solution: solution colorless. 12 + 2S2O32--+21- + S4O,2- Percent composition To obtain percent composition by mass, use the equation given here: 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. x 100% percent composition = mass due to specific component total mass of the mixture Fart A 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. > View Available Hint(s) ? HA P Pearson 9 1122
Chapter20: Applications Of Oxidation/reduction Titrations
Section: Chapter Questions
Problem 20.25QAP
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Transcribed Image Text:135 of 147
Constants Periodic Table
Analysis of bleach involves two sequential redox
reactions: First, bleach is reacted in acid solution
with excess iodide anion to produce yellow-colored
iodine:
CIO + 2H+ + 21-I2 + Cl- + H2O
A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 68.0 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 0.490 M sodium thiosulfate, NazS20.
containing the ion S203. A volume of 45.0 mL of sodium thiosulfate, the titrant, was needed to turn the
Then, to determine how much of the iodine was
formed, the solution is titrated with sodium
thiosulfate solution:
solution colorless.
I2 + 2S2O,2-→21- + S40,2-
Percent composition
To obtain percent composition by mass, use the equation given here:
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.
mass due to specific component
x 100%
percent composition
total mass of the mixture
• Fart A
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.
• View Available Hint(s)
HA
Pearson
90 11.22
aer
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