The electrochemical cell potential is illustrated by the image below.
To compute for electrochemical cell potential, two essential parameters are needed and these parameters are Positive Cell Potential (V2°) and Negative Cell Potential (V1°).
The formula for calculating electrochemical cell potential:
ΔV° = V2° – V1°
Where:
ΔV° = Electrochemical Cell Potential
V2° = Positive Cell Potential
V1° = Negative Cell Potential
Given an example;
Find the electrochemical cell potential when the positive cell potential is 14 and the negative cell potential is 7.
This implies that;
V2° = Positive Cell Potential = 14
V1° = Negative Cell Potential = 7
ΔV° = V2° – V1°
ΔV° = 14 – 7
ΔV° = 7
Therefore, the elecreochemical cell potential is 7 V.
Calculating the Positive Cell Potential when the Electrochemical Cell Potential and the Negative Cell Potential is Given.
V2° = ΔV° + V1°
Where:
V2° = Positive Cell Potential
ΔV° = Electrochemical Cell Potential
V1° = Negative Cell Potential
Let’s solve an example;
Find the positive cell potential when the electrochemical cell potential is 20 and the negative cell potential is 14.
This implies that;
ΔV° = Electrochemical Cell Potential = 20
V1° = Negative Cell Potential = 14
V2° = ΔV° + V1°
V2° = 20 + 14
V2° = 34
Therefore, the positive cell potential is 34 V.
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