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The ethyl mercaptan, C2H5SH, concentration in a mixture was determined by shaking a 1.534-g sample with...

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Chemistry

The ethyl mercaptan, C2H5SH, concentration in a mixture wasdetermined by shaking a 1.534-g sample with 60.0 mL of 0.01293 M I2in a tightly stoppered flask:

2C2H5SH + I2 →2C2H5SSC2H5 +2I- + 2H+

The excess I2 was back-titrated with 10.72 mL of 0.01425 MNa2S2O3:

2S2O32- + I2 →S4O62- + 2I-

Calculate the percentage of C2H5SH (FM =62.13 g/mol) in the mixture.

(a) 5.67% (b) 3.32% (c) 1.24% (d) 4.33%

(please show work)

Answer & Explanation Solved by verified expert
4.1 Ratings (689 Votes)
From the equation of the reaction between Thiosulfate and Iodine shows that 1 mol of Iodine is reduced by 2 moles of Thiosulfate Number of moles of Thiosulfate used for    See Answer
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