Suppose a student diluted and titrated a bleach unknown exactly as described in the experimental procedure, except only a single titration was performed which required 13.73mL of 0.100 M Na 2 S 2 O 3...

Suppose a student diluted and titrated a bleach unknown exactly as described in the experimental procedure, except only a single titration was performed which required 13.73mL of 0.100 M Na₂S₂O₃.

The density of the original, undiluted bleach unknown was 1.04 g/mL

1. Calculate the number of moles of Na₂S₂O₃
   used in the titration

mol

2. Calculate the number of moles of ClO^-
   in the sample titrated.
   Hint: The moles of thiosulfate simply equals the moles of sodium thiosulfate. From the moles of thiosulfate the moles of I2'>I2I2 can be easily determined from reaction (2). Now use reaction (1) to get the moles of hypochlorite, ClO-'>ClO−ClO-.
   

mol

3. Calculate the grams of NaClO in the titrated bleach sample,assuming all of the hypochlorite ion comes from sodium hypochlorite.
   Hint: The moles of sodium hypochlorite is simply the same as the moles of hypochlorite.
   

g

4. Calculate the mass in grams of
   
   UNDILUTED
   
   bleach that was in the sample of bleach titrated.
   Hint: Look at the hint provided in question 4 of the Data Analysis section of the experiment. The density to use is at the top of your prelab questions.
   

g

5. Using the
   
   UNROUNDED
   
   answers to questions 3 and 4, calculate the weight percent of NaClO in the undiluted bleach sample.
   Hint: Weight percent is the same thing as percent by mass.
   

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