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Nernst Potential Calculator

Nernst Potential Calculator
Calculate the cell potential (reduction potential) for a redox reaction using the Nernst equation.
Formula used -
E = E₀ − (RT/zF) × ln([red]/[ox])
Where: R = 8.314 J/(K·mol), F = 96485.3 C/mol, T in Kelvin

What Is the Nernst Potential?

The Nernst Potential Calculator estimates the electrochemical cell potential for redox reactions. It’s based on the well-known Nernst Equation, used in biochemistry, electrochemistry and cellular physiology. This tool helps determine the actual cell voltage under non-standard conditions, using the standard electrode potential (E°), temperature, and concentration of oxidized and reduced species.

Nernst Equation Used

E = E₀ − (RT/zF) × ln([Red]/[Ox])

Where:

  • E = Actual cell potential (in volts)
  • E₀ = Standard electrode potential (in volts)
  • R = Universal gas constant = 8.314 J/(K·mol)
  • T = Temperature in Kelvin (K = °C + 273.15)
  • F = Faraday's constant = 96485.3 C/mol
  • z = Number of electrons transferred
  • [Red], [Ox] = Concentration of reduced and oxidized forms (in M)

How to Use This Nernst Potential Calculator

  1. Enter the standard reduction potential (E₀) in volts.
  2. Set the temperature in degrees Celsius (defaults to 25°C).
  3. Provide z, the number of electrons involved in the reaction.
  4. Enter the molar concentrations of the reduced and oxidized species.
  5. Click Calculate to get the cell potential (E).

Result is shown up to four decimal places. It reflects how E° is adjusted due to actual concentrations and thermal energy. The calculator also shows the formula used so users can learn the working behind it.

Applications

  • Electrochemistry lab experiments
  • Cell membrane potential estimation in physiology
  • Battery and electrode research
  • Education and chemistry assignments

This tool assumes all concentrations are in molarity (M). It works best for systems where redox pairs are clearly defined. Also, it’s intended mainly for learning, academic use, and non-clinical research.

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