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

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.