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Question
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 Iâ» 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 OClâ» 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.
Answer
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