Certainly! Here's a transcription suitable for an educational website:---**Title: Analysis of H₂S Using Colorimetry and Iodine Generation**Hydrogen sulfide (H₂S) can be analyzed by titration with colorimetrically generated iodine (I₂). The I₂ is generated from potassium iodide (KI) via the following reaction:\[ 2I^- (aq) \rightarrow I_2 (aq) + 2e^- \]The generated I₂ then reacts in a 1:1 titration via:\[ H₂S (aq) + I₂ (aq) \rightarrow S (s) + 2H^+ (aq) + 2I^- (aq) \]**Example Calculation:**To determine the concentration of H₂S in a solution, consider the analysis of 50.00 mL of a solution containing H₂S. This solution was analyzed with dissolved KI using electrolysis requiring 812 seconds at a constant current of 526.0 mA. The task is to calculate the concentration of H₂S in the original solution.---This transcription provides a clear and concise explanation of the chemical reactions and procedure used for analyzing hydrogen sulfide via colorimetry, including relevant details for understanding the process.

The given reactions are 2I-(aq) →I2(aq)+2e-H2S(aq)+I2(aq)→S(s)+2H+(aq)+2I-(aq) Add the given reactions to arrive at the overall reaction. 2I-(aq) →I2(aq)+2e-H2S(aq)+I2(aq)→S(s)+2H+(aq)+2I-(aq)----------------------H2S(aq)→S(s)+2H+(aq)+2e- Overall reaction is H2S(aq)→S(s)+2H+(aq)+2e-The stoichiometric relation in the overall reaction is moles of H2Sits stoichiometric coefficient =moles of e-its stoichiometric coefficient moles of H2S1 =moles of e-2 moles of H2S =moles of e-2 moles of H2S =12×Current × timeFaraday constant moles of H2S =12×52.6 mA× 812 s96485 C mol-1 moles of H2S =12×52.6 ×10-3 A× 812 s96485 C mol-1 moles of H2S =12×52.6 ×10-3 C s-1× 812 s96485 C mol-1=0.221335959×10-3 mol moles of H2S =0.221335959×10-3 mol Calculate the concentration of H2S using the formula given below. [H2S] =moles of H2S Volume of H2S solution=0.221335959×10-3 mol50.00 mL [H2S] =0.221335959×10-3 mol50.00×10-3 L=4.43×10-3 M Answer is [H2S] =4.43×10-3 M

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Coulometry - H₂S can be analyzed by titration with coulometrically generated 12 The 12 is generated from KI via 2 I- (aq)---> 1₂ (aq) + 2 e- The generated I2 then reacts in a 1:1 titration via: H₂S (aq) + 12 (aq) ------------>S (s) + 2 H+ (aq) + 2 I (aq) Analysis of 50.00 mL of a solution containing H₂S was analyzed with dissolved KI. Electrolysis required 812 seconds at 52.6 mA current. What is the [H₂S] in the original solution?

Coulometry - H₂S can be analyzed by titration with coulometrically generated 12 The 12 is generated from KI via 2 I- (aq)---> 1₂ (aq) + 2 e- The generated I2 then reacts in a 1:1 titration via: H₂S (aq) + 12 (aq) ------------>S (s) + 2 H+ (aq) + 2 I (aq) Analysis of 50.00 mL of a solution containing H₂S was analyzed with dissolved KI. Electrolysis required 812 seconds at 52.6 mA current. What is the [H₂S] in the original solution?

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

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Certainly! Here's a transcription suitable for an educational website:

---

**Title: Analysis of H₂S Using Colorimetry and Iodine Generation**

Hydrogen sulfide (H₂S) can be analyzed by titration with colorimetrically generated iodine (I₂). The I₂ is generated from potassium iodide (KI) via the following reaction:

\[ 2I^- (aq) \rightarrow I_2 (aq) + 2e^- \]

The generated I₂ then reacts in a 1:1 titration via:

\[ H₂S (aq) + I₂ (aq) \rightarrow S (s) + 2H^+ (aq) + 2I^- (aq) \]

**Example Calculation:**

To determine the concentration of H₂S in a solution, consider the analysis of 50.00 mL of a solution containing H₂S. This solution was analyzed with dissolved KI using electrolysis requiring 812 seconds at a constant current of 526.0 mA. The task is to calculate the concentration of H₂S in the original solution.

---

This transcription provides a clear and concise explanation of the chemical reactions and procedure used for analyzing hydrogen sulfide via colorimetry, including relevant details for understanding the process.

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