Table 4 shows some electrode half-equations and their standard electrode potentials - AQA - A-Level Chemistry - Question 10 - 2017 - Paper 1
Question 10
Table 4 shows some electrode half-equations and their standard electrode potentials.
Electrode half-equation E° / V
Cl2(g) + 2e⁻ → 2Cl⁻(aq) ... show full transcript
Worked Solution & Example Answer:Table 4 shows some electrode half-equations and their standard electrode potentials - AQA - A-Level Chemistry - Question 10 - 2017 - Paper 1
Step 1
Deduce the oxidation state of nitrogen in NO3⁻ and in NO
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Answer
Nitrogen in NO3⁻: +5
Nitrogen in NO: +2
Step 2
State the weakest reducing agent in Table 4.
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Answer
The weakest reducing agent in Table 4 is Fe³⁺, as it has the lowest standard electrode potential.
Step 3
Write the conventional representation of the cell that has an EMF of +0.43 V.
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Answer
The conventional representation of the cell is:
Cu | Cu²⁺ || 2H⁺ | H2
Step 4
Use data from Table 4 to identify an acid that will oxidise copper.
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Answer
An acid that will oxidise copper is nitric acid (HNO3).
Explanation: Nitric acid is a stronger oxidizing agent as it contains NO3⁻ which can readily react with copper.
