Question

Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is −0.74. These two couples in their standard state are connected to make a cell. The cell potential will be ______.

Options

• +0.89 V

• +0.18 V

• +1.83 V

• +1.199 V

Answer 1

Standard electrode potential for Sn⁴⁺/Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr couple is −0.74. These two couples in their standard state are connected to make a cell. The cell potential will be +0.89 V.

Explanation:

Given: Sn⁴⁺/Sn²⁺ = +0.15 V

Cr³⁺/Cr = −0.74 V

Since Sn⁴⁺/Sn²⁺ has a higher potential, it acts as the cathode, and Cr³⁺/Cr acts as the anode.

Cell potential is calculated using:

\[\ce{E{^{\circ}_{cell}} = E{^{\circ}_{cathode}} - E{^{\circ}_{anode}}}\]

\[\ce{E{^{\circ}_{cell}}}\] = 0.15 − (−0.74)

= 0.15 + 0.74

= 0.89 V