Electrochemistry and cell electroplating

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Discussion Overview

The discussion revolves around the electroplating process in an electrochemical cell, specifically involving a zinc cathode and an inert anode in a copper ion solution. Participants explore the reactions that occur during electroplating, the balancing reactions at the anode, and the potential of the cell.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant inquires about the reaction that counterbalances the reduction of copper ions during electroplating and the potential of the cell.
  • Another participant suggests that if no other reactants are available and the potential is sufficiently high, the solvent may participate in the reaction.
  • A participant asserts that the electrolysis of water serves as a balancing reaction, questioning what the exact reaction is and which cations remain in the water.
  • One participant questions whether the inquiry is a homework question.
  • Another participant clarifies that the processes at the anode and cathode are separate and do not necessarily occur simultaneously.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the balancing reactions in electroplating, with some emphasizing the role of water electrolysis and others focusing on the separation of processes at the electrodes. The discussion remains unresolved regarding the exact reactions and their implications.

Contextual Notes

Participants have not reached a consensus on the specific reactions involved or the conditions under which they occur. There are assumptions regarding the availability of reactants and the potential of the cell that have not been fully explored.

dec123
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Hello, I have a question in regards to electroplating. If i have a cell with let's say a zinc cathode and an inert anode in a solution of copper ions, and I turn on the current, what reaction will counter the reduction of copper ions to balance the electronegativity and what will be the potential of the cell?
 
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Hint: if there is nothing else to react and potential is high enough, there is always solvent present.
 
Borek said:
Hint: if there is nothing else to react and potential is high enough, there is always solvent present.
Ok, but the electrolysis of water is a reaction that balances itself, if there is already reduction of metal on the cathode, there can be only another oxidation which balances that reduction, is that not correct? If so, what is the exact reaction and what cathions are left in the water?
 
Is this a homework question?
 
dec123 said:
Ok, but the electrolysis of water is a reaction that balances itself

No, it is a sum of two separate processes, one occurring on the anode, the other on the cathode. They don't have to happen both at the same time.
 

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