E cells- elecrode potentials Flashcards
What are the standard conditions for the H2 electrode?
100KPa, 298K, 1.00moldm-3
What is a common electrolyte solution for the salt bridge?
Potassium nitrate solution or potassium chloride solution
What is an electrochemical cell?
It consists of 2 half cells and uses electron transfer from redox reaction to produce electrical energy
What is a half cell?
Consists of 2 species of the same element in different oxidation states
What do the conducting wire and salt bridge carry?
Conducting wire- Electrons
Salt bridge- Ions
Why does the volt meter have to have high resistance?
Avoid any flow of current
What are all electrode potentials measured against?
Standard Hydrogen electrode has an electrode potential of zero volts
What is a standard electrode potential?
The EMF of a half cell compared with the standard hydrogen electrode under standard conditions.
In conventional representation what does:
a) Vertical solid line
b) Double vertical line
a) Phase boundary (different states)
b) Salt bridge
What is written next to the double vertical line?
The species with the highest oxidation state in each half cell
What features must be present in order to measure the electrode potential for an ion ion half cell?
1) Pt electrodes on both sides
2) Both oxidised and reduced species in the half cells
