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Identify the reaction at the anode, reaction at the cathode, the overall reaction, and the approximate potential required for the electrolysis of the following molten salts.

Identify the reaction at the anode, reaction at the cathode, the overall reaction, and the approximate potential required for the electrolysis of the following molten salts.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 18.59QE
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Identify the reaction at the anode, reaction at the cathode, the overall reaction, and the approximate potential required for the electrolysis of the following molten salts. Assume standard states and that the standard reduction potentials in Standard Electrode (Half-Cell) Potentials are the same as those at each of the melting points. Assume the efficiency is 100%.

  1. CaCl2
  2. LiH
  3. AlCl3
  4. CrBr
Standard Potentials at 25°C Half Reaction Potential Half Reaction Potential F2 + 20 2F" +2.87 V 2H + 20 - Hz 0.000 V O3 + 2H* + 2e - 02 + H20 F*- 3e + Fe +2.07 V -0.04 V Sz0+ 20 - Pb - 20 +2.05 V - Pb -0.13 V PBO2 + 4H* + So-+ 20 - PESO4 + 2H20 +1.69 V S2- 20 Sn -0.14 V Au+ Au +1.69 V -0.23 V Ph+ -20 - Po+ +1.67 V -0.26 V 2 HCIO + 2H* + 20 Cla + 2H0 Co + 20 +1.63 V - Co -0.20 V +1.61 V - In -0.34 V Mno + BH+ Se - Mn2 + 4H2O Pb904 + 20" Pb - so?- -0.36 V +1.51 V Au+- 30" +1.40 V Au + 20" - Cd -0.40 V Og - 20 - 201 +1.36 V -0.41 V Cr07- + 14H* + 6o" - 203 + 7H2O Fe. 20 +1.33 V - Fe -0.44 V O2 + 4H+ 4e 2H20 +1.23 V Zn -0.76 V MnO2 + 4H + 20 Mn2. 2H0 +1.21 V 2H20- 20 - Hy + 20H -0.83 V P+- 20 - P +1.20 V - 20 Or -0.91 V Brz 20 2Br Mn - 20 +1.00 V Mn -1.18 V 2Hg? + 20 +0.92 V v*- 20 - V -1.19 V Co+ H0. 20 - C"+ 20H" - Zn. s- +0.80 V Zns+ 20" -1.44 V Ag* +e + Ag +0.80 V A - 3e - AL -1.66 V Hg3* + 20 2Hg +0.79 V Mg2 + 20 Mg -2.36 V Fe+ - Na" + + Na +0.77 V -2.71 V Mno + 2H0 . 30" - Mnoz + 4OH" +0.60 V K* + - K -2.92 V 12 + 20 - 21" +0.54 V Li* +e - Li -3.05 V 02 + 2120 - 4e 4OH +0.40 V + Cu +0.34 V Note: al ions are aquoous (a), many neutral spocios are solids (2), although some are liquids (), gases (g), and ovon aqueous (ag). Use other sourcos for details on state. Thay wore purposely laft off hera to savo space and koop a cloaner looking tablo. Hg2Ce + 20 - 2Hg + 20r +0.27 V AgCI +o - Ag- Cr +0.22 V NO5 + H20 - 20 NOE + 20H +0.01 V 2H* + 20- Hg 0.000 V
Transcribed Image Text:Standard Potentials at 25°C Half Reaction Potential Half Reaction Potential F2 + 20 2F" +2.87 V 2H + 20 - Hz 0.000 V O3 + 2H* + 2e - 02 + H20 F*- 3e + Fe +2.07 V -0.04 V Sz0+ 20 - Pb - 20 +2.05 V - Pb -0.13 V PBO2 + 4H* + So-+ 20 - PESO4 + 2H20 +1.69 V S2- 20 Sn -0.14 V Au+ Au +1.69 V -0.23 V Ph+ -20 - Po+ +1.67 V -0.26 V 2 HCIO + 2H* + 20 Cla + 2H0 Co + 20 +1.63 V - Co -0.20 V +1.61 V - In -0.34 V Mno + BH+ Se - Mn2 + 4H2O Pb904 + 20" Pb - so?- -0.36 V +1.51 V Au+- 30" +1.40 V Au + 20" - Cd -0.40 V Og - 20 - 201 +1.36 V -0.41 V Cr07- + 14H* + 6o" - 203 + 7H2O Fe. 20 +1.33 V - Fe -0.44 V O2 + 4H+ 4e 2H20 +1.23 V Zn -0.76 V MnO2 + 4H + 20 Mn2. 2H0 +1.21 V 2H20- 20 - Hy + 20H -0.83 V P+- 20 - P +1.20 V - 20 Or -0.91 V Brz 20 2Br Mn - 20 +1.00 V Mn -1.18 V 2Hg? + 20 +0.92 V v*- 20 - V -1.19 V Co+ H0. 20 - C"+ 20H" - Zn. s- +0.80 V Zns+ 20" -1.44 V Ag* +e + Ag +0.80 V A - 3e - AL -1.66 V Hg3* + 20 2Hg +0.79 V Mg2 + 20 Mg -2.36 V Fe+ - Na" + + Na +0.77 V -2.71 V Mno + 2H0 . 30" - Mnoz + 4OH" +0.60 V K* + - K -2.92 V 12 + 20 - 21" +0.54 V Li* +e - Li -3.05 V 02 + 2120 - 4e 4OH +0.40 V + Cu +0.34 V Note: al ions are aquoous (a), many neutral spocios are solids (2), although some are liquids (), gases (g), and ovon aqueous (ag). Use other sourcos for details on state. Thay wore purposely laft off hera to savo space and koop a cloaner looking tablo. Hg2Ce + 20 - 2Hg + 20r +0.27 V AgCI +o - Ag- Cr +0.22 V NO5 + H20 - 20 NOE + 20H +0.01 V 2H* + 20- Hg 0.000 V
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