What Is the Standard Electrolysis Potential for Substance X?

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Discussion Overview

The discussion revolves around determining the standard electrolysis potential for a substance referred to as "X." Participants engage in exploring the Nernst equations for half cells, the reactions involved, and the interpretation of various chemical species in the context of electrolysis.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants inquire about the standard potential for substance X and express confusion regarding the electrochemical reactions involved.
  • There are requests to write Nernst equations for both half cells, indicating a need for clarity on the electrochemical processes.
  • Participants discuss the reactions, with one stating that lead (Pb) gives electrons while hydronium ions (H3O+) give protons, but there is uncertainty about the correct representation of the reactions.
  • One participant suggests that hydrogen is oxidized to H+ in the presence of water, while another challenges the interpretation of hydrogen and its relation to H3O+.
  • There is a disagreement regarding the correct formulation of the half-cell reactions, with some participants asserting that one reaction consumes electrons while the other consumes hydrogen.
  • Several participants express frustration and confusion about constructing the total response and understanding the equilibrium expressions.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct half-cell reactions or the overall electrochemical process. Multiple competing views on the interpretation of the reactions and the role of different species remain unresolved.

Contextual Notes

Participants express uncertainty about the definitions and roles of various chemical species, such as H3O+ and the interpretation of hydrogen in the reactions. There are also unresolved mathematical steps related to constructing the Nernst equations and total responses.

Who May Find This Useful

This discussion may be of interest to individuals studying electrochemistry, particularly those looking to understand the complexities of half-cell reactions and the application of Nernst equations in determining electrolysis potentials.

nhrock3
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what is the standard potential for the given x
?
 
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Write Nernst equations for both half cells.
 
Last edited by a moderator:
i can't interpret it
on the left
Pb gives 2 electrons
on the right H3O+ give H+
what is pt(s)
?
 
Solid (and inert) platinum electrode. Half cell is H+/H2, Pt is only a contact.
 
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so i have
Pb=Pb+2e
H_2+H^+=H_3O^+

what to do now
?
 
Last edited:
Read my answers again? I hate to repeat myself.
 
Last edited by a moderator:
"Write Nernst equations for both half cells."

there are 4 ingredients for 4 given concentrations
i don't know how to build the expression for equlibrium.
and i don't know the total E0

ven if i would want to find the E0
i can't construct a total responce because the first give electrons and the other give H+
 
Write reaction equations for both half cells. These are separate reactions, and they are both producing or consuming electrons.
 
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no

one consuumes electrons the other comsumes hirogen
 
  • #10
Try to write reactants and products for both.
 
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  • #11
i have
Pb=Pb+2e
H_2+H^+=H_3O^+

what to do now
?
 
  • #12
The second one is wrong. Hydrogen is oxidized to H+ in presence of water.
 
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  • #13
i don't know how to intepret it
 
  • #14
Let's try with something simpler - hydrogen oxidized to H+.
 
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  • #15
H=H^+ +e
 
  • #16
Apart from the fact that hydrogen is not H, that's correct - as you see, electrons are involved after all. What happens to H+ in water?
 
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  • #17
dont know
 
  • #18
What is H3O+?

--
methods
 
  • #19
ok so it transfrmed into H3o+
 
  • #20
but i can't solve this question
 

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