Question

The concentration of an aqueous solution of NaOCl (sodium hypochlorite; the active ingredient in household bleach)...

The concentration of an aqueous solution of NaOCl (sodium hypochlorite; the active ingredient in household bleach) can be determined by a redox titration with iodide ion in acidic solution: OCl−(aq)+2I−(aq)+2H+(aq)→Cl−(aq)+I2(aq)+H2O(l) . Assume that the blue spheres in the buret represent I− ions, the red spheres in the flask represent OCl- ions, the concentration of the I−I− ions in the buret is 0.175 MM , and the volumes in the buret and the flask are identical.

A) What is the concentration of NaOCl in the flask?

B) What percentage of the I− solution in the buret must be added to the flask to react with all the OCl− ions?

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