Electrochemistry_II

Front

What is the standard cell potential (E°) of a galvanic cell?

Back

The standard cell potential (E°) is the voltage of a galvanic cell under standard conditions (1 M concentration, 1 atm pressure, and 25°C). It is calculated using the standard reduction potentials of the half-reactions.

Front

How do you calculate the equilibrium constant (K) from the cell potential (E°)?

Back

The equilibrium constant (K) can be calculated using the equation: nFE° = RT ln K, where n is the number of moles of electrons transferred, F is Faraday's constant, R is the gas constant, and T is the temperature in Kelvin.

Front

What is the Nernst equation?

Back

The Nernst equation relates the cell potential (E) to the standard cell potential (E°) and the concentrations of the reactants and products: E = E° - (RT/nF) ln Q, where Q is the reaction quotient.

Front

What is the reaction quotient (Q) in electrochemistry?

Back

The reaction quotient (Q) is a measure of the relative concentrations of products and reactants at any point in a reaction. It is calculated using the concentrations of the products raised to their stoichiometric coefficients divided by the concentrations of the reactants raised to their stoichiometric coefficients.

Front

What is the significance of a positive standard cell potential?

Back

A positive standard cell potential indicates that the reaction is spontaneous under standard conditions.

Front

What does a negative standard reduction potential indicate?

Back

A negative standard reduction potential indicates that the species is a weaker oxidizing agent compared to the standard hydrogen electrode.

Front

How does concentration affect cell potential?

Back

The cell potential can change with concentration according to the Nernst equation. As the concentration of reactants increases, the cell potential may increase, and vice versa.

Front

What is Faraday's constant (F)?

Back

Faraday's constant (F) is the amount of electric charge per mole of electrons, approximately equal to 96485 C/mol.

Front

What is the relationship between cell potential and Gibbs free energy?

Back

The relationship is given by the equation: ΔG = -nFE, where ΔG is the change in Gibbs free energy, n is the number of moles of electrons transferred, F is Faraday's constant, and E is the cell potential.

Front

What is the standard reduction potential for the half-reaction: Cu²⁺ + 2e⁻ → Cu?

Back

The standard reduction potential for this half-reaction is +0.34 V.