Ethyl Mercaptan (C2H5SH) is a colorless or yellowish liquid or a gas with a pungent, garlic or skunk-like odor. The concentration of this compound was determined by shaking a 3.47 g sample with 54.63 mL of 0.01204 M Iodine (I2) in a tightly stoppered flask. The reaction is shown below.2 C2H5SH + I2 ---> C2H5SSC2H5 + 2 I- + 2H+The excess I2 was back titrated with 18.51 mL of 0.01437 M Na2S2O3 according to the reaction:I2(aq) + 2 S2O32-(aq) à 2I- (aq) + S4O62-(aq)Calculate the percentage C2H5SH (MW = 62.14 g/mol).

Back titration is a titration method in which the concentration of an analyte is determined by…

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Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter20: Environmental Chemistry-earth's Environment, Energy, And Sustainability

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Problem 50IL

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Ethyl Mercaptan (C₂H₅SH) is a colorless or yellowish liquid or a gas with a pungent, garlic or skunk-like odor. The concentration of this compound was determined by shaking a 3.47 g sample with 54.63 mL of 0.01204 M Iodine (I₂) in a tightly stoppered flask. The reaction is shown below.

2 C₂H₅SH + I₂ ---> C₂H₅SSC₂H₅+ 2 I^- + 2H⁺

The excess I₂ was back titrated with 18.51 mL of 0.01437 M Na₂S₂O₃ according to the reaction:

I_2(aq) + 2 S₂O₃^2-_(aq) à 2I^- _(aq) + S₄O₆^2-(aq)

Calculate the percentage C₂H₅SH (MW = 62.14 g/mol).

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