the standard electrode potential value for copper is positive what is possible reason for this?
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the electrode potential of metals is decided by the following factors:
1. Enthalpy of atomisation.
2. Ionisation enthalpy.
3. Hydration enthalpy.
It says that the first two take energy while the latter releases energy.
The potential as it is given there is vs. standard hydrogen electrode(SHE) which has an arbitrary assigned value of 0.0000V. Through the choice of another reference, it is very easy to make all of those numbers positive or negative. The absolute value of the half cell potential can only be useful in comparison to others. So you could make arguments like Cu has a more positive potential compared to Ni(by 0.59V).
1. Enthalpy of atomisation.
2. Ionisation enthalpy.
3. Hydration enthalpy.
It says that the first two take energy while the latter releases energy.
The potential as it is given there is vs. standard hydrogen electrode(SHE) which has an arbitrary assigned value of 0.0000V. Through the choice of another reference, it is very easy to make all of those numbers positive or negative. The absolute value of the half cell potential can only be useful in comparison to others. So you could make arguments like Cu has a more positive potential compared to Ni(by 0.59V).
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