Name: Sydney Reid College ID: 0591992 Thomas Edison State University General Chemistry II (CHE-112) Section no.: Semester and year: May 2017 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+2→ Fe+3+ H2 O (in acidic solution) Half reactions: Oxidation: Fe2+Fe3+ So Fe2+Fe3+ + e -- (A) Reduction: H2O2H2 O Balance the charge and atoms So H2O2 +2H+ + 2e2H2 O -- (B) Add both equations, A and B and cancel out the electrons to get H2O2 + 2Fe+2+ 2H+2Fe+3+ 2H2O b.Cu + HNO3→ Cu+2 + NO + H2O (in acidic solution)
Half reactions: Oxidation: CuCu2+ So CuCu2+ + 2e -- (A) Reduction: HNO3NO Balance the charge and atoms So HNO3 +3H+ + 3e2H2O + NO -- (B) Add both equations, A and B and cancel out the electrons to get 3Cu + 2HNO3+ 6H+3Cu2++ 4H2O + 2NO c. CN–+ MnO4–→ CNO– + MnO2(in basic solution) Using the same procedure as in a and b to get 3CN-+ 2MnO-4+ H2O3CNO-+ 2OH- + 2MnO 2d. Br2→ BrO3 –+ Br–(in basic solution) 3Br
Want to read all 7 pages?
Previewing 3 of 7 pages Upload your study docs or become a member.
Want to read all 7 pages?
Previewing 3 of 7 pages Upload your study docs or become a member.
End of preview
Want to read all 7 pages? Upload your study docs or become a member.
