Solution Potential Witout Electrodes (Pourbaix diagram help)

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SUMMARY

This discussion focuses on the use of the Pourbaix diagram to understand the voltage potential of a CuCl2 solution in a non-electrochemical cell scenario. The user is attempting to plate CuCl2- onto a magneli phase Titanium oxide membrane using a 10mM CuCl2 solution in 0.5 molar HCl at pH ~0.8. It is established that without an electrochemical cell, the voltage potential of the solution will be approximately 0, provided there are no other reducing agents present, such as hydronium ions, which at low pH will not significantly affect the potential.

PREREQUISITES
  • Understanding of Pourbaix diagrams and their application in electrochemistry
  • Familiarity with the Nernst equation for calculating electrochemical potentials
  • Knowledge of pH effects on electrochemical systems
  • Basic concepts of electrochemical cells and their components
NEXT STEPS
  • Research the implications of pH on the stability of CuCl2 in acidic solutions
  • Explore the use of Pourbaix diagrams for different metal ions
  • Investigate the kinetics of hydrogen production in low pH environments
  • Learn about the design and function of electrochemical cells for plating applications
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Researchers in electrochemistry, materials scientists, and engineers involved in surface coating processes, particularly those working with titanium oxide membranes and copper compounds.

JasonSpata
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files.php?pid=81742&aid=2099.gif
http://C:\Users\jason\Desktop\Research Summer 2016\cucl pb.PNG I am currently attempting to use SEA to plate CuCl2- on to the surface of a magneli phase Titanium oxide membrane.
I can roughly rationalize the y-axis and how it functions when there is an electrochemical cell (follow OCP), and how to calculate the potential utilizing the Nernst equation, but what if there is no Echem cell?

I will dissolve CuCl2 in acid (pH ~ .8) so the window I am aiming for in which my desired species predominates is tight. (I know the Pourbaix diagram is concentration and temperature dependent but I really just seek to understand exactly what the y-axis means)

My question is, If I dissolve x amount of CuCl2 in .5 molar HCl, (10mM CuCl2 solution) in a beaker, in ambient conditions, what would the voltage potential of the solution be? Would it just be 0? Do I need to have an Echem cell in order to have any potential at all? Any help is greatly appreciated.
 
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Yes, as long as you don't have another reducing agent in your solution, the potential will be 0. The only relevant reducing agent I can think of is hydronium ions, But near ph=1 their potential will be approx 0 and production of hydrogen will be hindered kinetically.
 

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