-The Concentration of an Aqueous Solution of NaOCl Can Be

question 44

Multiple Choice

-The concentration of an aqueous solution of NaOCl can be determined by a redox titration with iodide ion in acidic solution: OCl^- (aq) + 2 I^- (aq) + 2 H⁺ (aq) → Cl⁻ (aq) + I₂ (aq) + H₂O (l)
Assume that the black spheres in the buret represent I⁻ ions,the gray spheres in the flask represent OCl⁻ ions,the concentration of the I⁻ ions in the buret is 0.120 M,and the volumes in the buret and the flask are identical.What is the concentration of the NaOCl in the flask,and what fraction of the I⁻ solution in the buret must be added to the flask to react with all the OCl⁻ ions?

• A)0.0400 M NaOCl;1/3 of the I⁻ must be added.
• B)0.0400 M NaOCl;2/3 of the I⁻ must be added.
• C)0.0600 M NaOCl;1/3 of the I⁻ must be added.
• D)0.0600 M NaOCl;2/3 of the I⁻ must be added.

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