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a. Use information from the electrochemical series in the Data Book to write a balanced overall equation that shows hydrogen peroxide, H₂O₂, reacting as a reductant - VCE - SSCE Chemistry - Question 1 - 2009 - Paper 1
Question 1
a. Use information from the electrochemical series in the Data Book to write a balanced overall equation that shows hydrogen peroxide, H₂O₂, reacting as a reductant.... show full transcript
Worked Solution & Example Answer:a. Use information from the electrochemical series in the Data Book to write a balanced overall equation that shows hydrogen peroxide, H₂O₂, reacting as a reductant - VCE - SSCE Chemistry - Question 1 - 2009 - Paper 1
Step 1
Use information from the electrochemical series in the Data Book to write a balanced overall equation that shows hydrogen peroxide, H₂O₂, reacting as a reductant.
Answer
The balanced overall equation showing hydrogen peroxide acting as a reductant can be expressed as follows:
In this reaction, hydrogen peroxide is oxidized while the Fe³⁺ ions are reduced.
Step 2
Provide one possible chemical reason that explains why the predicted reaction was not observed.
Answer
One possible reason for the lack of reaction between Cu²⁺ ions and H₂ gas is that the standard reduction potential of Cu²⁺/Cu is higher than that of H⁺/H₂. This means that H₂ does not have a sufficient driving force to reduce Cu²⁺ to Cu, thus no reaction occurs.