Question

Standard electrode potential for Cr3+/Cr couple is -0.74 V and that for Fe3+/Fe2+ couple is 0.77 V. These two couples in their standard state are connected to make a cell. The cell potential will be ​

Answer 1

Answer:

1.51 V

Explanation:

Fe3+/Fe2+ couple is taken as cathode and Cr3+/Cr is taken as anode. The standard reduction potential of cathode minus standard reduction potential of anode gives the value of standard cell potential.

Answer 2

Given:

Standard electrode potential for Cr3+/Cr couple is -0.74 V and that for Fe3+/Fe2+ couple is 0.77 V.

To find:

Cell potential ?

Calculation:

• In this question, the half cell potential are actually reduction potentials.

• So, cell potential can be calculated by subtracting the the standard reduction potential of the two half cells

Let Cell Potential be V :

$\implies V= 0.77 - ( - 0.74)$

$\implies V= 0.77 + 0.74$

$\implies V= 1.51 \: volts$

So, cell potential is 1.51 volts.