Back
to top
effect of temperature on electrode potentials
Watch this threadPage 1 of 1
Go to first unread
Skip to page:
The__Bait
Badges:
0
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
i am struggling to understand how increasing the temperature increases electrode potentials. is this something to do with particle kinematics or le chatelier's principle?
0
reply
charco
Badges:
18
Rep:
?
You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report
#2
Increasing the temperature AFFECTS electrode potentials, not increases them.
The electrode potential is a measure of the extent of a redox process - negative and the equilibrium lies relatively to the LHS (compared to the standard hydrogen electrode)
example: Zn2+(aq) + 2e --> Zn(s)
The process is not quite as simple as it appears. To move from right to left the equilibrium has to have the zinc atomised and then ionised and then the ions solvated.
Each of these processes is either exo or endothermic and is affected by the temperature.
The equilibrium between the ions and the pure metal is also affected by the temperature.
If the equilibrium is exothermic overall from left to right then an increase in the temperature will make the equilibrium move more to the left hand side making the electrode potential more negative.
The reverse is also true - if the equilibrium is endothermic overall from left to right then increasing the temperature makes the electrode potential more positive.
The electrode potential is a measure of the extent of a redox process - negative and the equilibrium lies relatively to the LHS (compared to the standard hydrogen electrode)
example: Zn2+(aq) + 2e --> Zn(s)
The process is not quite as simple as it appears. To move from right to left the equilibrium has to have the zinc atomised and then ionised and then the ions solvated.
Each of these processes is either exo or endothermic and is affected by the temperature.
The equilibrium between the ions and the pure metal is also affected by the temperature.
If the equilibrium is exothermic overall from left to right then an increase in the temperature will make the equilibrium move more to the left hand side making the electrode potential more negative.
The reverse is also true - if the equilibrium is endothermic overall from left to right then increasing the temperature makes the electrode potential more positive.
1
reply
X
Page 1 of 1
Go to first unread
Skip to page:
Quick Reply
