What is the oxidation number of Mn in the product when Mn is used as a reducing agent in a basic solution? nE° (V) 6 4 2 0 -2 -4 Mn 0 Frost diagram for manganese Mn²+ Mn(OH)2 1 2 Mn3+ MnO₂ Mn₂O3 3 H3MnO4 MnO₂ 4 HMnO4 MnO43- 5 MnO4²- 6 7 MnO4™ pH = 0 pH = 14 MnO4-
What is the oxidation number of Mn in the product when Mn is used as a reducing agent in a basic solution? nE° (V) 6 4 2 0 -2 -4 Mn 0 Frost diagram for manganese Mn²+ Mn(OH)2 1 2 Mn3+ MnO₂ Mn₂O3 3 H3MnO4 MnO₂ 4 HMnO4 MnO43- 5 MnO4²- 6 7 MnO4™ pH = 0 pH = 14 MnO4-
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
Transcribed Image Text:## Oxidation Numbers and Frost Diagram for Manganese
**Question:**
What is the oxidation number of Mn in the product when Mn is used as a reducing agent in a basic solution?
### Frost Diagram Explanation:
The Frost diagram for manganese illustrates the relative stability of manganese in different oxidation states. This diagram plots the standard Gibbs free energy per mole of electrons (nE°) against the oxidation number.
- **Axes:**
- *Y-Axis (nE°/V):* Represents the free energy per mole of electrons.
- *X-Axis (Oxidation number):* Represents the oxidation states of manganese, ranging from 0 to 7.
- **Key Points and Lines:**
- In the diagram, there are lines for two different pH values:
- **Blue Line (pH = 0):** Acidic conditions.
- **Red Line (pH = 14):** Basic conditions.
- Both lines start from Mn (oxidation number 0) and pass through various manganese compounds:
- Mn(OH)₂, Mn²⁺, Mn₃⁺, Mn₂O₃, MnO₂, H₃MnO₄, and others.
- In basic conditions (red line), MnO₄²⁻ appears as a stable state at higher oxidation numbers.
### Conclusion:
Under basic conditions, manganese typically stabilizes at an oxidation state where the compound MnO₄²⁻ is prevalent. Therefore, when Mn is used as a reducing agent in a basic solution, it is likely to result in MnO₄²⁻ with an oxidation number of 6.
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