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Ã¢Å¡Â¡ How to Calculate Standard Cell Potential

Use reduction-potential tables to identify cathode and anode, calculate standard cell potential, and know when the Nernst equation is needed.

lessons

~12 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Read the tableRead reduction entries and their reference state.Tables list reduction potentials relative to the standard hydrogen electrode.
Choose cell rolesChoose cathode and anode from table entries.The more positive reduction is favored, while the other entry runs backward as oxidation.
Calculate the potentialCalculate a standard cell potential.Balance reactions without scaling potentials, then subtract anode reduction from cathode reduction.
Interpret the resultInterpret and qualify the calculated potential.The sign relates to thermodynamic direction, and voltage relates to work per charge under stated conditions.

Questions this course answers

What does a standard reduction-potential table list?

The tabulated electrode values are assigned to reduction directions.

Which formula uses two tabulated reduction potentials?

Subtracting the anode reduction potential accounts for reversing that half-reaction.

What happens to a potential when a half-reaction is multiplied?

Electrode potentials are intensive values; only reaction coefficients change.

For a spontaneous galvanic direction under standard conditions, what sign is expected?

A positive standard cell potential corresponds to negative standard Gibbs energy for that direction.

What should you do when concentrations are not standard?

Nonstandard activities change the cell potential from its standard value.

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