Problem: What is the cell potential of the cell described with shorthand notation below?Mg(s) I Mg+2(aq,10-3 M) II Al+3(aq,0.1 M) I Al(s)1) -0.7 V2) 0.7 V3) 0.634. 0.77

FREE Expert Solution

We are asked to calculate for the Ecell for the reaction

Mg(s) I Mg+2(aq,10-3 M) II Al+3(aq,0.1 M) I Al(s)


Recall that the Nernst Equation relates the concentrations of compounds and cell potential.

Ecell=E°cell-(0.05916 Vn) log Q

Ecell = cell potential under non-standard conditions
cell = standard cell potential
n = mole e- transferred
Q = reaction quotient = products/reactants


We're going to calculate for the Ecell using the following steps:

Step 1: Identify the anode and the cathode in the reaction and write the overall reaction
Step 2: 
Calculate the cell potential of the reaction.
Step 3: 
Calculate Ecell using the Nernst Equation.

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Problem Details

What is the cell potential of the cell described with shorthand notation below?
Mg(s) I Mg+2(aq,10-3 M) II Al+3(aq,0.1 M) I Al(s)

1) -0.7 V

2) 0.7 V

3) 0.63

4. 0.77