What is the Nernst equation used for calculating the cell potential under non-standard conditions?
Practice Questions
1 question
Q1
What is the Nernst equation used for calculating the cell potential under non-standard conditions?
E = E° - (RT/nF)ln(Q)
E = E° + (RT/nF)ln(Q)
E = E° - (nF/RT)ln(Q)
E = E° + (nF/RT)ln(Q)
The Nernst equation is E = E° - (RT/nF)ln(Q), where R is the gas constant, T is temperature, n is moles of electrons, and F is Faraday's constant.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the Nernst equation used for calculating the cell potential under non-standard conditions?
Solution: The Nernst equation is E = E° - (RT/nF)ln(Q), where R is the gas constant, T is temperature, n is moles of electrons, and F is Faraday's constant.
Steps: 5
Step 1: Understand that the Nernst equation helps us find the voltage (cell potential) of an electrochemical cell when conditions are not standard.
Step 2: Know the formula: E = E° - (RT/nF)ln(Q). Here, E is the cell potential, E° is the standard cell potential, R is the gas constant, T is the temperature in Kelvin, n is the number of moles of electrons transferred, F is Faraday's constant, and Q is the reaction quotient.
Step 3: Identify the values you need: E° (standard potential), R (8.314 J/(mol·K)), T (temperature in Kelvin), n (moles of electrons), F (96485 C/mol), and Q (concentration of products over reactants).
Step 4: Calculate Q using the concentrations of the reactants and products in the reaction.
Step 5: Plug the values into the Nernst equation to calculate E, the cell potential under the given conditions.
