Problem: 2 H+(aq) + Fe(s) → H2(g) + Fe2+(aq)1) Indicate the half-reaction occurring at Anode.Express your answer as a chemical equation. Identify all of the phases in your answer.2) Indicate the half-reaction occurring at Cathode.Express your answer as a chemical equation. Identify all of the phases in your answer.

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2 H+(aq) + Fe(s) → H2(g) + Fe2+(aq)


Step 1. Separate the overall reaction into two half-reactions

H+(aq) → H2(g)

Fe(s) → Fe2+(aq)


Step 2. Balance the elements in each half-reaction.

2 H+(aq) → H2(g)

Fe(s) → Fe2+(aq)


Step 3. Balance the charges: add electrons to the more positive side (or less negative side) 

2 H+(aq) + 2 e- → H2(g)

Fe(s) → Fe2+(aq) + 2 e- 

→ electrons are balanced


Step 4. Determine the oxidation half-reaction and the reduction half-reaction. 

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Problem Details

2 H+(aq) + Fe(s) → H2(g) + Fe2+(aq)

1) Indicate the half-reaction occurring at Anode.

Express your answer as a chemical equation. Identify all of the phases in your answer.

2) Indicate the half-reaction occurring at Cathode.

Express your answer as a chemical equation. Identify all of the phases in your answer.

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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 Redox Reaction concept. You can view video lessons to learn Redox Reaction. Or if you need more Redox Reaction practice, you can also practice Redox Reaction practice problems.