The Nernst Equation Video Lessons

Concept:

Problem: A student devises an electrochemical cell with the following cell notation:Cr (s) | Cr2+ (aq, 0.02 M) | | Co2+ (aq, 0.9 M) | Co (s)Calculate Δε for this galvanic cell. Show all work and circle and circle your final answer.

FREE Expert Solution

For this problem, we’re being asked to calculate for the Ecell with the cell notation:

Cr (s) | Cr2+ (aq, 0.02 M) | | Co2+ (aq, 0.9 M) | Co (s)

To do so, follow these steps:

Step 1. Determine the E°cell and value of n

Step 2. Calculate Ecell

Step 1. When writing a cell notation, we use the following format – “as easy as ABC

Loss of Electron is an Oxidation process undergone by the Reducing Agent (LEORA). In the Anode, Oxidation happens (An Ox)

Gain of Electron is a Reduction process undergone by the Oxidizing Agent (GEROA). Reduction happens in the Cathode (Red Cat)

We can determine the anode and cathode by comparing their E° values.

• ↓ E° → oxidation → anode

• ↑ E° → reduction → cathode

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Problem Details

A student devises an electrochemical cell with the following cell notation:

Cr (s) | Cr2+ (aq, 0.02 M) | | Co2+ (aq, 0.9 M) | Co (s)

Calculate Δε for this galvanic cell. Show all work and circle and circle your final answer.