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Nernst Equation - Electrochemistry Video Lecture | Physical Chemistry

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FAQs on Nernst Equation - Electrochemistry Video Lecture - Physical Chemistry

1. What is the Nernst equation in electrochemistry?
Ans. The Nernst equation is a mathematical equation that relates the standard electrode potential, temperature, and concentration of ions to the cell potential of an electrochemical cell. It is given by E = E° - (RT/nF) * ln(Q), where E is the cell potential, E° is the standard electrode potential, R is the gas constant, T is the temperature in Kelvin, n is the number of moles of electrons transferred in the balanced equation, F is Faraday's constant, and Q is the reaction quotient.
2. How is the Nernst equation derived?
Ans. The Nernst equation is derived from the principles of thermodynamics and electrochemistry. It is based on the relationship between the free energy change of a reaction and the cell potential. By applying the principles of Gibbs free energy and the concept of equilibrium, the Nernst equation can be derived for electrochemical cells.
3. What is the significance of the Nernst equation in electrochemistry?
Ans. The Nernst equation is of great significance in electrochemistry as it allows us to determine the cell potential at non-standard conditions. It helps in understanding how changes in temperature and concentration affect the cell potential. By using the Nernst equation, we can calculate the potential of an electrochemical cell under any given conditions, which is crucial for various applications in fields such as batteries, corrosion, and fuel cells.
4. How does the Nernst equation relate to the pH of a solution?
Ans. The Nernst equation can be used to relate the pH of a solution to the cell potential of an electrochemical cell. In the case of a half-cell involving hydrogen ions, the Nernst equation can be written as E = E° - (0.0592/n) * log[H+], where [H+] represents the concentration of hydrogen ions. By measuring the cell potential and knowing the standard electrode potential, the pH of a solution can be determined using the Nernst equation.
5. Can the Nernst equation be used for all electrochemical cells?
Ans. The Nernst equation can be used for electrochemical cells involving reversible reactions. However, it may not be applicable for cells with irreversible reactions or when other factors such as resistance or current flow significantly affect the cell potential. In such cases, modifications to the Nernst equation or other equations may be required to accurately calculate the cell potential.
83 videos|142 docs|67 tests
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