Your Total Savings ₹1500 What is electrode potential?
Electrode potential, also known as redox potential, is the ability of a species to gain or lose electrons, i.e., its reduction or oxidation potential. It's a measure of the tendency of a chemical species to be reduced or oxidized, expressed in volts. Each half-cell in an electrochemical cell has an associated electrode potential.
What is the standard electrode potential?
The standard electrode potential is the potential of a half-cell under standard conditions, which are typically 25°C, a 1 Molar solution for each ion participating in the reaction, and a pressure of 1 bar for gases. It is relative to the potential of the standard hydrogen electrode (SHE), which is arbitrarily set at 0 volts.
How does electrode potential relate to spontaneity of redox reactions?
The spontaneity of a redox reaction can be predicted using the electrode potentials of the half-reactions involved. If the total electrode potential (E°) for the reaction, calculated as the potential of the cathode half-cell minus the potential of the anode half-cell, is positive, the reaction is spontaneous. If it's negative, the reaction is non-spontaneous.
What is the Nernst equation, and what does it help determine?
The Nernst equation is a formula that calculates the electrode potential of a half-cell or full cell at non-standard conditions. It accounts for the effect of concentration and temperature on the cell potential. It allows us to predict the voltage of a cell under non-standard conditions and to determine equilibrium constants for reactions.
What is a reference electrode and why is it important?
A reference electrode is an electrode with a stable, well-known electrode potential. The most commonly used one is the standard hydrogen electrode. Reference electrodes are important because all electrode potentials are measured relative to a reference electrode. They are used in electrochemical measurements and in the construction of electrochemical cells.