# Electroliz potential question

1. Jan 29, 2010

### nhrock3

what is the standard potential for the given x
?

2. Jan 29, 2010

### Staff: Mentor

Write Nernst equations for both half cells.

Last edited by a moderator: Aug 13, 2013
3. Jan 29, 2010

### nhrock3

i cant interpret it
on the left
Pb gives 2 electrons
on the right H3O+ give H+
what is pt(s)
?

4. Jan 30, 2010

### Staff: Mentor

Solid (and inert) platinum electrode. Half cell is H+/H2, Pt is only a contact.

Last edited by a moderator: Aug 13, 2013
5. Jan 30, 2010

### nhrock3

so i have
Pb=Pb+2e
H_2+H^+=H_3O^+

what to do now
?

Last edited: Jan 30, 2010
6. Jan 30, 2010

### Staff: Mentor

Last edited by a moderator: Aug 13, 2013
7. Jan 30, 2010

### nhrock3

"Write Nernst equations for both half cells."

there are 4 ingredients for 4 given concentrations
i dont know how to build the expression for equlibrium.
and i dont know the total E0

ven if i would want to find the E0
i cant construct a total responce because the first give electrons and the other give H+

8. Jan 30, 2010

### Staff: Mentor

Write reaction equations for both half cells. These are separate reactions, and they are both producing or consuming electrons.

Last edited by a moderator: Aug 13, 2013
9. Jan 30, 2010

### nhrock3

no

one consuumes electrons the other comsumes hirogen

10. Jan 30, 2010

### Staff: Mentor

Try to write reactants and products for both.

Last edited by a moderator: Aug 13, 2013
11. Jan 30, 2010

### nhrock3

i have
Pb=Pb+2e
H_2+H^+=H_3O^+

what to do now
?

12. Jan 30, 2010

### Staff: Mentor

The second one is wrong. Hydrogen is oxidized to H+ in presence of water.

Last edited by a moderator: Aug 13, 2013
13. Jan 30, 2010

### nhrock3

i dont know how to intepret it

14. Jan 30, 2010

### Staff: Mentor

Let's try with something simpler - hydrogen oxidized to H+.

Last edited by a moderator: Aug 13, 2013
15. Jan 30, 2010

### nhrock3

H=H^+ +e

16. Jan 30, 2010

### Staff: Mentor

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?

Last edited by a moderator: Aug 13, 2013
17. Jan 30, 2010

### nhrock3

dont know

18. Jan 30, 2010

### Staff: Mentor

What is H3O+?

--
methods

19. Jan 30, 2010

### nhrock3

ok so it transfrmed into H3o+

20. Jan 30, 2010

### nhrock3

but i cant solve this question