hmwrk 10.docx - Thomas Edison State University General Chemistry II with Labs(CHE-122 Section no Semester and year Spring 2019 Written Assignment 10

hmwrk 10.docx - Thomas Edison State University General...

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Thomas Edison State University General Chemistry II with Labs (CHE-122) Section no.: Semester and year: Spring 2019 Written Assignment 10: Electrochemistry Answer all assigned questions and problems, and show all work. 1.Balance the following redox equations by the ion-electron method: (25 points)a.H2O2+ Fe+2Fe+3+ H2O (in acidic solution)2Fe+2+ H2O2+ 2H+2Fe+3+ 2H2b.Cu + HNO3→ Cu+2 + NO + H2O (in acidic solution)3Cu + 2HNO36H+→ 3Cu+2 + 2NO + c.CN+ MnOCNO+ MnO2(in basic solution)3CN+ 2MnO4H2O→ 3CNO+ 2MnO2+ 2OH- d.Br2BrO+ Br(in basic solution)3Br2 +2OH-BrO3+ 5Br+ 2He.S2O3–2+ I2I+ S4O62–(in acidic solution)2O3–2+ I2→ 2 I+ S4O6(Reference: Chang 18.1)2.Calculate the standard emf of a cell that uses the Mg/Mg+2and Cu/Cu+2half-cell reactions at 25ºC. Write the equation for the cell reaction that occurs under standard-state conditions. (10 points) O 4H 2 O 4 3 2 O 2S 2–

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