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The Eθ(M2+/M) value for copper is positive (+0.34V). What is possibly the reason for this? (Hint: consider its high ΔaHθ and low ΔhydHθ)
Asked by Asif Last Modified
Answer The Eθ(M2+/M) value of a metal depends on the energy changes involved in the following:
1. Sublimation: The energy required for converting one mole of an atom from the solid state to the gaseous state.
17-11-08_Sonali_12_Chemistry_8_10_html_m263db253.gif){kind=small}
2. Ionization: The energy required to take out electrons from one mole of atoms in the gaseous state.
17-11-08_Sonali_12_Chemistry_8_10_html_m3fd2b9c9.gif){kind=small}
3. Hydration: The energy released when one mole of ions are hydrated.
17-11-08_Sonali_12_Chemistry_8_10_html_m4a07f070.gif){kind=small}
Now, copper has a high energy of atomization and low hydration energy. Hence, the Eθ(M2+/M) value for copper is positive.
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