One method of analysing the manganese content of steel is to dissolve the steel in nitric acid; producing a solution of manganese(II) ions, Mn²⁺(aq) - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1
Question 2
One method of analysing the manganese content of steel is to dissolve the steel in nitric acid; producing a solution of manganese(II) ions, Mn²⁺(aq).
The Mn²⁺(aq) i... show full transcript
Worked Solution & Example Answer:One method of analysing the manganese content of steel is to dissolve the steel in nitric acid; producing a solution of manganese(II) ions, Mn²⁺(aq) - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1
Step 1
i. Give a half equation for the conversion of IO₄⁻(aq) into IO₃⁻(aq) in acid solution.
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Answer
The half-equation for the reduction of iodate ions is as follows:
IO4−(aq)+2H+(aq)+2e−→IO3−(aq)+H2O(l)
This equation shows the iodate ion being reduced to iodate in the presence of protons, with the transfer of electrons.
Step 2
ii. Is the IO₄⁻(aq) ion acting as an oxidant or reductant? Explain your choice.
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Answer
The IO₄⁻(aq) ion is acting as an oxidant. This is because it facilitates the oxidation of Mn²⁺ to MnO₄⁻, indicating that it has the ability to accept electrons from another species. As IO₄⁻ is reduced in the process, its oxidation state decreases, confirming its role as an oxidizing agent.
