Make a comparison of the strength of MnO4 as an oxidizing agent in acidic and basic solution nE° (V) 6 4 2 0 -2 -4 Mn 0 Frost diagram for manganese Mn²+ Mn(OH)2 1 2 MnO₂ Mn3+ H3MnO4 Mn₂O3 MnO₂ 3 4 Oxidation number HMnO4 MnO4³- 5 MnO4²- 6 7 MnO4- pH = 0 pH = 14 MnO4-
Make a comparison of the strength of MnO4 as an oxidizing agent in acidic and basic solution nE° (V) 6 4 2 0 -2 -4 Mn 0 Frost diagram for manganese Mn²+ Mn(OH)2 1 2 MnO₂ Mn3+ H3MnO4 Mn₂O3 MnO₂ 3 4 Oxidation number HMnO4 MnO4³- 5 MnO4²- 6 7 MnO4- pH = 0 pH = 14 MnO4-
Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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
Transcribed Image Text:**Comparison of MnO₄⁻ as an Oxidizing Agent in Acidic and Basic Solutions**
**Description:**
The Frost diagram for manganese presents a graphical comparison of the standard reduction potentials (nE°) of various manganese species across different oxidation states, ranging from 0 to +7. It is essential to understand how these species behave as oxidizing agents in both acidic (pH = 0) and basic (pH = 14) conditions.
**Graph Explanation:**
- **Axes:**
- The x-axis represents the oxidation number of manganese, from 0 to +7.
- The y-axis represents the standard reduction potential (nE°) in volts.
- **Lines:**
- The blue line corresponds to acidic conditions (pH = 0).
- The red line corresponds to basic conditions (pH = 14).
**Key Points on the Frost Diagram:**
1. **Oxidation Number 0:**
- Manganese (Mn) starts at nE° = 0 for both conditions.
2. **Acidic Conditions (pH = 0):**
- The blue line shows that Mn⁷⁺ in MnO₄⁻ is a strong oxidizing agent, with a high nE° value compared to other species.
- As the oxidation state decreases, the reduction potential initially lowers and then rises again, indicating varying oxidizing strengths of the species.
3. **Basic Conditions (pH = 14):**
- The red line indicates that MnO₄⁻ still acts as an oxidizing agent, but with a lower nE° value compared to acidic conditions.
- The curve presents a gradual increase from Mn(OH)₂ through higher oxidation states, showing weaker oxidizing power than in acidic conditions.
**Conclusion:**
The Frost diagram visually demonstrates the enhanced oxidizing power of MnO₄⁻ in acidic environments compared to basic ones. This difference affects the reduction potential and reactivity, valuable for understanding manganese chemistry's environmental and practical implications.
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