Calculate Eo (reduction potential) for the following balanced reaction.
NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3
To calculate the reduction potential (Eo) for a given reaction, you need to use a standard reduction potential table. This table provides the reduction potential values for each half-reaction involved in the overall reaction. Here is how you can calculate Eo for the given balanced reaction:
Step 1: Split the balanced reaction into two half-reactions.
NiO2 + 2 H2O + 2 Fe(OH)2 → Ni(OH)2 + 2 Fe(OH)3
Half-reaction 1: NiO2 + 2 H2O + 4 e- → Ni(OH)2 + 2 OH-
Half-reaction 2: 2 Fe(OH)2 → 2 Fe(OH)3 + 2 e-
Step 2: Look up the known reduction potentials (Eo) for each half-reaction from a standard reduction potential table. These values are typically given in volts (V) or millivolts (mV).
Step 3: The reduction potential of the overall reaction is given by the sum of the reduction potentials of the two half-reactions:
Eo(reduction) = Eo(half-reaction 1) + Eo(half-reaction 2)
Step 4: Substitute the known Eo values into the equation and solve for Eo(reduction).
For example, let's assume we have the following Eo values for the two half-reactions:
Eo(half-reaction 1) = 0.35 V
Eo(half-reaction 2) = -0.70 V
Eo(reduction) = 0.35 V + (-0.70 V) = -0.35 V
Therefore, the reduction potential (Eo) for the given balanced reaction is -0.35 V.