**Consider these two entries from a fictional table of standard reduction potentials.**

**X3+ + 3e- rightarrow x(s) E = -2.00 V Y3+ + 3e- **

**What is the standard potential of a cell where X is the anode and Y is the cathode?**

**Concepts and reason**

The question is based on calculating the overall cell potential, for the given reaction. It is calculated using the following formula:

To calculate , the half-cell reactions with the overall reaction must be determined.

**Fundamentals**

Overall cell potential : It is the cell potential of the overall net reaction. It is calculated as follows:

Here,is the standard reduction potential of the reaction occurring at cathode; and is the standard reduction potential of the reaction occurring at anode.

While writing the half-cell reaction, oxidation occurs at anode and reduction occurs at cathode.

The overall reaction is written by combining both the half-cell reactions.

**Answer:**

Consider the given half-cell reactions occurring at different electrodes:

It is given that X is the anode and Y is the cathode for the half-cell reactions. Moreover, oxidation reaction occurs at anode and reduction reaction occurs at cathode.

Therefore, the half-cell reaction of anode will be reversed but, its standard reduction potential will remain same.

The overall cell reaction is written by combining both the half-cell reactions and cancelling the common electrons present in them.

Calculate the overall standard cell potential as follows:

Standard cell potential,, for the given reaction is **1.51 V.**

Substitute the values of standard reduction potentials of cathode and anode in the given formula to calculate the value of overall cell potential.