How to Calculate and Solve for Nernst Equation | Corrosion
Last Updated on July 29, 2022
The nernst equation is illustrated by the image below.
To compute for nernst equation, seven essential parameters are needed and these parameters are Electrochemical Cell Potential (ΔV°), Gas Constant (R), Temperature (T), Number of Electrons (n), Faraday’s Constant (F), Molar Concentration [M1n+] and Molar Concentration [M2n+].
The formula for caluclating nernst equation:
ΔV = ΔV° – RT/nF In(M1n+/M2n+)
Where:
ΔV = Nernst Equation | Potential
ΔV° = Electrochemical Cell Potential
R = Gas Constant
T = Temperature
n = Number of Electrons
F = Faraday’s Constant
M1n+ = Molar Concentration
M2n+ = Molar Concentration
Let’s solve an example;
Find the nernst equation when the electrochemical cell potential is 8, the gas constant is 2, the temperature is 5, the number of electrons is 3, the faraday’s constant is 9, the molar concentration is 10 and the molar concentration is 4.
This implies that;
ΔV° = Electrochemical Cell Potential = 8
R = Gas Constant = 2
T = Temperature = 5
n = Number of Electrons = 3
F = Faraday’s Constant = 9
M1n+ = Molar Concentration = 10
M2n+ = Molar Concentration = 4
ΔV = ΔV° – RT/nF In(M1n+/M2n+)
ΔV = 8 – ((2)(5)/(3)(9)) In(10/4)
ΔV = 8 – (10/27) In (2.5)
ΔV = 8 – 0.37 (0.91)
ΔV = 8 – (0.339)
ΔV = 7.66
Therefore, the nernest equation is 7.66 V.
Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the nernest equation.
To get the answer and workings of the nernst equation using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.
You can get this app via any of these means:
Web – https://www.nickzom.org/calculator-plus
To get access to the professional version via web, you need to register and subscribe to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator
Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Materials and Metallurgical under Engineering.
Now, Click on Corrosion under Materials and Metallurgical
Now, Click on Nernst Equation under Corrosion
The screenshot below displays the page or activity to enter your values, to get the answer for the nernst equation according to the respective parameters which are the Electrochemical Cell Potential (ΔV°), Gas Constant (R), Temperature (T), Number of Electrons (n), Faraday’s Constant (F), Molar Concentration [M1n+] and Molar Concentration [M2n+].
Now, enter the values appropriately and accordingly for the parameters as required by the Electrochemical Cell Potential (ΔV°) is 8, Gas Constant (R) is 2, Temperature (T) is 5, Number of Electrons (n) is 3, Faraday’s Constant (F) is 9, Molar Concentration [M1n+] is 10 and Molar Concentration [M2n+] is 4.
Finally, Click on Calculate
As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the nernst equation and presents the formula, workings and steps too.