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The Nernst Equation quiz

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Terms in this set (15)

  • What does the Nernst equation quantitatively connect in electrochemistry?
    It connects the concentrations of compounds to the cell potential under nonstandard conditions.
  • Under what conditions do we use the Nernst equation instead of standard cell potential?
    We use it when concentrations are not 1 M, temperature is not 25°C, pH is not 7, or pressure is not 1 atm.
  • What does E°cell represent in the Nernst equation?
    E°cell is the cell potential under standard conditions.
  • What is the value and unit of the gas constant R used in the Nernst equation?
    R is 8.314 joules per mole per kelvin (J/mol·K).
  • What does the variable n represent in the Nernst equation?
    n is the number of electrons transferred in the redox reaction.
  • What is Faraday’s constant (F) and its value?
    Faraday’s constant is 9.649 × 10⁴ coulombs per mole of electrons.
  • What does the reaction quotient Q represent in the Nernst equation?
    Q is the ratio of products to reactants, similar to the equilibrium expression.
  • What is the simplified value of RT/F at 25°C in the Nernst equation?
    RT/F simplifies to 0.0257 volts at 25°C.
  • How can the Nernst equation be rewritten using logarithms (log) instead of natural logarithms (ln)?
    It becomes Ecell = E°cell - (0.05916 V/n) × log Q.
  • What happens to the cell potential as the reaction proceeds and Q increases?
    The cell potential decreases over time until it reaches zero at equilibrium.
  • What is the relationship between the equilibrium constant K and standard cell potential E°cell using natural logarithms?
    ln K = n × E°cell / 0.0257 V.
  • How is the equilibrium constant K related to E°cell using base-10 logarithms?
    K = 10^(n × E°cell / 0.05916 V).
  • What is the connection between Gibbs free energy (ΔG°) and the equilibrium constant K?
    ln K = ΔG° / RT, so K = e^(ΔG°/RT).
  • How is Gibbs free energy (ΔG) related to cell potential (Ecell)?
    ΔG = -n × F × Ecell.
  • Why is the Nernst equation important for nonstandard conditions?
    It allows calculation of cell potential when concentrations, temperature, or pressure differ from standard conditions.