-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.
Correct Answer:
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