Question: A student performed three CH 2 Cl 2 layer titrations in Part 2 using a standard sodium thiosulfate solution with a concentration of 0.01150 M.

A student performed three CH2Cl2 layer titrations in Part 2 using a standard sodium thiosulfate solution with a concentration of 0.01150 M. They reported the following measurements:

Determination #1 Determination #2 Determination #3
Final CH2Cl2 Layer Burette Reading 29.99 mL 37.45 mL 44.86 mL
Initial CH2Cl2 Layer Burette Reading 22.78 mL 29.99 mL 37.45 mL
Final Thiosulfate Burette Reading 28.56 mL 28.89 mL 28.68 mL
Initial Thiosulfate Burette Reading 1.21 mL 1.08 mL

1.00 mL

What is the concentration of iodine (in mol/L) in the CH2Cl2 phase based on the data from their first titration (ie. their first determination)? Report your answer to the correct number of significant figures and only report the numerical value (no units).

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