Electrode Potentials

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Last updated 2:47 PM on 4/12/26
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13 Terms

1
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electrochemical series definition

list of electrode potentials in numerical order

2
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standard conditions

298K, 100 kPa, [H+]= 1 mol dm^-3

3
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salt bridge purpose

ions in the ionic substance of the salt bridge move across it, to complete the circuit

4
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standard hydrogen electrode

H2 gas at 100 kPa
1 mol dm^-3 HCl
Pt electrode, temperature of 298K

5
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why is EMF 0?

conc. of the same ion is equal in both.

6
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H2/O2 Fuel Cell Equation

Anode: H2 → 2H+ + 2e-

Cathode: O2 +4H+ +4e- → 2H2O

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Risks of H2/O2 fuel cells and benefits

reduced use of fossil fuels, safe by product

difficult to carry and transport, risk of explosion

8
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Nickel Hydride Batteries

anode: Ni(OH)2 + OH- <=> NiO(OH) + H2O + e-

cathode: H2O + M + e- <=> OH- + MH

9
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Lithium Batteries

Li+ +CoO2 + e- → Li[CoO2]

Li → Li+ + e-

10
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why no need to replace electrolytes

reagent is produced in one equation and used in another

11
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how is a current produced in a fuel cell

e- released at negative electrode passes through external circuit to the positive electrode

12
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why is storing the fuel as a liquid better than a gas

easier to transport as it occupies less volume and is less volatile

13
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why is EMF same in two different fuel cells

both have the same overall reaction