Use the room temperature (25 C) thermodynamic equilibria and data listed below to plot the E-pH...
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Use the room temperature (25 C) thermodynamic equilibria and data listed below to plot the E-pH diagram for the Cd-H;0 system in the presence of 10 activity (10 m) of dissolved cadmium species. Use a scale of 10 mm/pH unit and 50 mm/V. Label the regions of corrosion, passivity and immunity. (a) 2+ Cd +2e - Cd ca" + 2H:0- Cd(OH), + 2H Ca(OH), -HCdo +H HCDO 2 +3H +2c - Cd + 2H O Cd(OH), +2H +2e -Cd +2H O ions N.B. When constructing your diagram show by calculation that HCDO2 predominate at pH > 11.01 and Cd ions predominate at pH <11.01. Standard chemical free energies G° at 25°C Snecies G° (J/mol) (s) (aa) Cd -77.612 -363,500 (aa) HCDO (s) Cd(OH) -473.600 (g) 0. (e) Ha 0. (aa) H 0. (1) H.O -237.178 CO Cd (s) (aa) -77.612 (aa) HCDO -363,500 (s) -473.600 (HOPO (g) (g) Ha (aa) H. (1) H.O -237.178 (s) = solid; (aq) - aqueous; (g) gas; (1) liquid. Gas constant R-8.3144 J.K .mol. (b) On your E-pH diagram, plot the boundary region for the stability of H,0 at 1 atm pressure, using G data from the table in (a) and the following equilibria: ..... 2H +2e -H. 0 +4H+ 4e-2H_ O (c) Based on your E-pH diagram, is it possible to use an aqueous solution of Cd ions for industrial electroplating purposes and have 100% current efficiency during the Cd plating operation? Give reasons for your answer. 2+ Use the room temperature (25 C) thermodynamic equilibria and data listed below to plot the E-pH diagram for the Cd-H;0 system in the presence of 10 activity (10 m) of dissolved cadmium species. Use a scale of 10 mm/pH unit and 50 mm/V. Label the regions of corrosion, passivity and immunity. (a) 2+ Cd +2e - Cd ca" + 2H:0- Cd(OH), + 2H Ca(OH), -HCdo +H HCDO 2 +3H +2c - Cd + 2H O Cd(OH), +2H +2e -Cd +2H O ions N.B. When constructing your diagram show by calculation that HCDO2 predominate at pH > 11.01 and Cd ions predominate at pH <11.01. Standard chemical free energies G° at 25°C Snecies G° (J/mol) (s) (aa) Cd -77.612 -363,500 (aa) HCDO (s) Cd(OH) -473.600 (g) 0. (e) Ha 0. (aa) H 0. (1) H.O -237.178 CO Cd (s) (aa) -77.612 (aa) HCDO -363,500 (s) -473.600 (HOPO (g) (g) Ha (aa) H. (1) H.O -237.178 (s) = solid; (aq) - aqueous; (g) gas; (1) liquid. Gas constant R-8.3144 J.K .mol. (b) On your E-pH diagram, plot the boundary region for the stability of H,0 at 1 atm pressure, using G data from the table in (a) and the following equilibria: ..... 2H +2e -H. 0 +4H+ 4e-2H_ O (c) Based on your E-pH diagram, is it possible to use an aqueous solution of Cd ions for industrial electroplating purposes and have 100% current efficiency during the Cd plating operation? Give reasons for your answer. 2+
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Related Book For
Fundamentals of Physics
ISBN: 978-0471758013
8th Extended edition
Authors: Jearl Walker, Halliday Resnick
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