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)
Answers
Given : The Eθ(M2+/M) value for copper is positive (+0.34V).
Solution :
Possibly the reason for this is the energy changes in Sublimation , Ionisation and Hydration .
The energy changes in Sublimation , Ionisation and Hydration are as follows :
Sublimation:
In this process the energy needed for converting one mole of an atom from the solid state to the gaseous state.
M(s) → M(g) ∆(s)H (sublimation energy)
Ionisation :
In this process the energy needed to take out electrons from one mole of atoms in the gaseous state.
M(g) → M2+(aq) ∆(i)H (Ionisation energy)
Hydration :
In this process the energy released when one mole of ions are hydrated.
M2+(g) → M2+(aq) ∆(hyd)H (Hydration energy)
Copper has a high energy of atomisation and low hydration energy.
Hence , the Eθ(M2+/M) value for copper is positive.
Hope this answer will help you…..
Some more questions :
Write down the number of 3d electrons in each of the following ions: Ti2+, V2+, Cr3+, Mn2+, Fe2+, Fe3+, CO2+, Ni2+ and Cu2+. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).
https://brainly.in/question/17094086
For M2+/M and M3+/M2+ systems, the values for some metals are as follows: Cr2+/Cr −0.9V Cr3/Cr2+ −0.4 V Mn2+/Mn −1.2V Mn3+ /Mn2+ +1.5 V Fe2+ /Fe −0.4V Fe3+/Fe2+ +0.8 V Use this data to comment upon: (i) The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and (ii) The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
https://brainly.in/question/17093959
Explanation:
1. Sublimation: The energy required for converting one mole of an atom from the solid state to the gaseous state.
2. Ionization: The energy required to take out electrons from one mole of atoms in the gaseous state.
3. Hydration: The energy released when one mole of ions are hydrated.