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1. The concentration of an aqueous solution of I3- can be determined by a reaction with aqueous sodium thiosulfate, Na2S2O3:
2 S2O32- (aq) + I3- (aq) + → S4O62- (aq) + 3 I- (aq)
Assume that the black spheres in the buret represent S2O32- ions, the gray spheres in the flask represent I3- ions, the concentration of the S2O32- ions in the buret is 0.240 M, and the volumes in the buret and the flask are identical. What is the concentration of the I3- in the flask, and what fraction of the S2O32- solution in the buret must be added to the flask to react with all the I3- ions?
A) 0.0800 M I3-; 1/3 of the S2O32- must be added.
B) 0.0800 M I3-; 2/3 of the S2O32- must be added.
C) 0.1200 M I3-; 1/3 of the S2O32- must be added.
D) 0.1200 M I3-; 2/3 of the S2O32- must be added.
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