Problem: A sample of a new cleaning product, "Joe's Famous Cleaner," with a mass of 64.0 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 0.390 M sodium thiosulfate, Na2S2O3, containing the ion S2O32-. A volume of 45.0 mL of sodium thiosulfate, the titrant, was needed to turn the solution colorless.What is the percentage composition by mass of NaClO in the bleach product?Express your answer to three significant figures and include the appropriate units.

FREE Expert Solution

We’re being asked to determine the percentage composition by mass of NaClO in the bleach product.

Recall the mass percent formula:

% mass=mass componenttotal mass×100

mole I2=moles NaClO=45 mL Na2S2O3(10-3 L1 mL)(0.390mol Na2S2O3L Na2S2O3)(1 mol NaClO2 mol Na2S2O3)=0.008775 mol 

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Problem Details

A sample of a new cleaning product, "Joe's Famous Cleaner," with a mass of 64.0 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 0.390 M sodium thiosulfate, Na2S2O3, containing the ion S2O32-. A volume of 45.0 mL of sodium thiosulfate, the titrant, was needed to turn the solution colorless.

What is the percentage composition by mass of NaClO in the bleach product?

Express your answer to three significant figures and include the appropriate units.