-The Concentration of an Aqueous Solution of Fe²⁺ Can Be

question 183

Multiple Choice

-The concentration of an aqueous solution of Fe²⁺ can be determined by a redox titration with aqueous bromate ion,BrO₃⁻: 6 Fe²⁺ (aq) + BrO₃⁻ (aq) + 6 H⁺ (aq) → 6 Fe³⁺ (aq) + Br⁻ (aq) + 3 H₂O (l)
Assume that the black spheres in the buret represent BrO₃⁻ ions,the gray spheres in the flask represent Fe²⁺ ions,the concentration of the BrO₃⁻ 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 Fe²⁺ in the flask,and what fraction of the BrO₃⁻ solution in the buret must be added to the flask to react with all the Fe²⁺ ions?

• A)0.0200 M Fe²⁺;1/18 of the BrO₃⁻ must be added.
• B)0.0200 M Fe²⁺;1/3 of the BrO₃⁻ must be added.
• C)0.0400 M Fe²⁺;1/18 of the BrO₃⁻ must be added.
• D)0.0400 M Fe²⁺;1/3 of the BrO₃⁻ must be added.

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