Calculate Ecell for The Following Electrochemical Cell at 25c

Introduction

The standard electrode potential (ECell) is a measure of the tendency of a chemical species to acquire electrons and thereby be reduced. It's a fundamental concept in electrochemistry that helps predict the direction of electron flow in electrochemical cells.

This calculator allows you to compute the standard electrode potential for any given electrochemical cell at 25°C. The calculation takes into account the standard reduction potentials of the half-cells involved and their stoichiometric coefficients.

How to Use This Calculator

To use this calculator, follow these simple steps:

1. Enter the standard reduction potential (E°red) for the cathode half-reaction in volts.
2. Enter the standard reduction potential (E°red) for the anode half-reaction in volts.
3. Enter the number of electrons transferred in the cathode half-reaction.
4. Enter the number of electrons transferred in the anode half-reaction.
5. Click the "Calculate" button to compute the standard electrode potential.

The calculator will display the ECell value in volts along with an explanation of the result.

Formula Explained

The standard electrode potential (ECell) for an electrochemical cell is calculated using the following formula:

Where:

• E°red(cathode) is the standard reduction potential for the cathode half-reaction
• E°red(anode) is the standard reduction potential for the anode half-reaction

This formula assumes that the cell operates under standard conditions (1 atm pressure, 1 M concentration, and 25°C temperature).

Worked Example

Let's calculate the standard electrode potential for the following electrochemical cell:

Zn(s) | Zn²⁺(aq) || Cu²⁺(aq) | Cu(s)

Given:

• E°red(Cu²⁺/Cu) = +0.34 V
• E°red(Zn²⁺/Zn) = -0.76 V

Using the formula:

This means the standard electrode potential for this cell is 1.10 volts.