The ethyl mercaptan (C2H5SH, 62.13 g/mol) concentration in a mixture was determined by shaking a 1.534 g sample with 50.0 mL of 0.01293 M I2 in a tightly stoppered flask:2 C2H5SH (aq) + I2 (aq) --> C4H10S2 (aq) + 2 I- (aq) + 2 H+ (aq)The excess I2 was back-titrated with 15.72 mL of 0.01425 M Na2S2O3:I2 (aq) + 2 S2O32- (aq) --> 2 I- (aq) + S4O62- (aq)Calculate the percentage of ethyl mercaptan in the sample (3 sf)

1.534 g sample50.0 mL of 0.01293 M I215.72 mL of 0.01425 M Na2S2O3

Answered: The ethyl mercaptan (C2H5SH, 62.13…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The ethyl mercaptan (C₂H₅SH, 62.13 g/mol) concentration in a mixture was determined by shaking a 1.534 g sample with 50.0 mL of 0.01293 M I₂ in a tightly stoppered flask:

2 C₂H₅SH (aq) + I₂ (aq) --> C₄H₁₀S₂ (aq) + 2 I^- (aq) + 2 H⁺ (aq)

The excess I₂ was back-titrated with 15.72 mL of 0.01425 M Na₂S₂O₃:

I₂ (aq) + 2 S₂O₃^2- (aq) --> 2 I^- (aq) + S₄O₆^2- (aq)

Calculate the percentage of ethyl mercaptan in the sample (3 sf)

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