Problem: A voltaic cell with Ni/Ni 2+ and Co/Co2+ half-cells has the following initial concentrations: [Ni2+] = 0.80 M; [Co 2+] = 0.20 M.(a) What is the initial Ecell?

FREE Expert Solution

Step 1. Write the two half-cell reactions and determine the half-cell potentials (refer to the Standard Reduction Potential Table)

Ni2+(aq) + 2 e- Ni(s)                        E° = -0.230 V
Co2+(aq) + 2 e- Co(s)                     E° = -0.277 V                


Step 2. Identify the reduction half-reaction (cathode) and the anode half-reaction (anode)

Co2+(aq) + 2 e- Co(s)                     E° = -0.277 V               ↓ E° → oxidation → anode
Ni2+(aq) + 2 e- Ni(s)                        E° = -0.230 V                ↑ E° → reduction → cathode


Step 3. Get the overall reaction by balancing the number of electrons transferred then adding the oxidation half-reaction and reduction half-reaction.

lose electrons  oxidation → anode

gain electrons  reduction → cathode

82% (82 ratings)
View Complete Written Solution
Problem Details

A voltaic cell with Ni/Ni 2+ and Co/Co2+ half-cells has the following initial concentrations: [Ni2+] = 0.80 M; [Co 2+] = 0.20 M.

(a) What is the initial Ecell?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the The Nernst Equation concept. You can view video lessons to learn The Nernst Equation. Or if you need more The Nernst Equation practice, you can also practice The Nernst Equation practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Mertz's class at WVU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.