The active ingredient in commercial bleach is sodium hypochlorite, NaOCl, which can be determined by — Stoichiometry Chemistry Question
Question
The active ingredient in commercial bleach is sodium hypochlorite, NaOCl, which can be determined by iodometric analysis as indicated in these equations.
OCl– + 2H+ + 2I– → I2 + Cl– + H2O
I2 + 2S2O3 2– → S4O6 2– + 2I–
If 1.356 g of a bleach sample requires 19.50 mL of 0.100 M Na2S2O3 solution, what is the percentage by mass of NaOCl in the bleach?
A.
2.68%
B.
3.70%
C.✓ Correct
5.35%
D.
10.7%
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