All Flashcards
Define E°cell.
Cell potential under standard conditions (298.15 K, 1 atm, 1 M concentrations).
Define Ecell.
Cell potential under non-standard conditions.
Define the reaction quotient, Q.
A measure of the relative amount of products and reactants present in a reaction at a given time. Used to determine if a reaction is at equilibrium.
Define Faraday's constant (F).
The charge of one mole of electrons, approximately 96485 C/mol e-.
Define 'n' in the Nernst Equation.
Moles of electrons transferred in the balanced redox reaction.
What is the effect of increasing product concentration on Q?
Q increases.
What is the effect of Q > 1 on Ecell?
Ecell decreases (Ecell < E°cell).
What happens to Ecell as a galvanic cell approaches equilibrium?
Ecell decreases and approaches 0.
What happens to ΔG when Ecell is positive?
ΔG is negative, indicating a spontaneous reaction.
What is the impact of increasing the concentration of reactants on the cell voltage?
The cell voltage increases.
How to determine Q for the reaction: ?
Q =
Steps to predict Ecell relative to E°cell using Q.
- Calculate Q. 2. If Q > 1, Ecell < E°cell. 3. If Q < 1, Ecell > E°cell.
How do you calculate E°cell at equilibrium using the Nernst Equation?
Set Ecell = 0 and Q = K in the Nernst Equation, then solve for E°cell.
What is the formula of Nernst Equation?
or
How to relate ΔG to Ecell?
ΔG = -nFEcell