What is the chemical potential?
The amount of energy change in the system per varying amount of material
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What is the Gibbs Free Energy expressed electrically? (equation)
n in mol
F charge of one mol of ions (faraday constant)
E potential in Volt
What are the effects of different free enthalphies on the Voltage of the galvanic cell?
Derive the relationship between the Gibbs free enthalphy and the electrical energy.
Give the Nernst equation.
How is the standard half cell potential measured?
In comparison to the hydrogen reaction.
The standard potential of the zink reaction is -0.76V compared to the standard electrode.
Do the electrons flow towards the Hydrogen electrode for a comperativly negative or positive potential?
The electrons flow from the lowest to the highest potential.
How is the chemical activity calculated?
comparison with standard state:
p0: 10^5 Pa=1atm
c0: 1mol/l
…
What are two substitutes for a Platin Hydrogen reference electrode? What are their potentials?
saturated calomel electrode (E=0,242):
silver-silver chloride reference electrode(E=0,222):
What is the difference between the standard electrode potential and the Galvanic series?
The standard electode potential describes elemental materials, the galvanic series technicall alloys
What is the reaction depicted by the b line in a pourbaix diagramm?
acidic dissociation of water above
What is the reaction depicted by the a line in a pourbaix diagramm?
alkaline dissociation of water below
How is the Nernst equation simplified for room temperature?
What is the concentration border for ionic dissolution in Pourbaix diagramms?
10^-6 mol/l
What are the 4 zones in the Aluminium Pourbaix diagramm?
How is the phenomenum of starting corrosion in a passivity layer, by increasing the Voltage, called?
transpassive dissolution
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