Question

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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 15.06 mL of 0.100 M Na2S2O3.
1. Calculate the number of moles of Na2S2O3 used in the titration.
2. Calculate the number of moles of ClO- in the sample titrated.
Hint for proper stoichiometry:
1) Clo-+2I-+2H+------> I2+Cl-+H2O
2) I2+2S2O2-3--------> 2I-+S4O2-6
3. Calculate the grams of NaClO in the titrated bleach sample (assuming all of the hypocholorite ion comes from sodium hypochlorite).
4. Calculate the mass in grams in UNDILUTED bleach that was in the sample of bleach titrated.
(each titration sample must also contain one-fifth of the original UNDILUTED bleach. since 5.00 mL of undiluted bleach were originally used, each titration sample contains one-fifth of the 5.00 mL of undiluted bleach).
5. Usiing the answers to questions 3 and 4, calculate the weight percent of NaClO in the undiluted bleach sample.

Answer 1