Alumina (Al_2O_3) is insoluble in water becau | vedclass

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(B) The solubility of an ionic compound in water depends on the balance between its lattice energy and hydration energy. For $Al_2O_3$,the lattice ene

Vedclass · Accepted Answer

It has high lattice energy and low heat of hydration

Vedclass · Answer

(B) The solubility of an ionic compound in water depends on the balance between its lattice energy and hydration energy. For $Al_2O_3$,the lattice energy is extremely high due to the high charge density of $Al^{3+}$ and $O^{2-}$ ions. When $Al_2O_3$ is placed in water,the energy released during the hydration of these ions (hydration energy) is not sufficient to overcome the very high lattice energy required to break the crystal structure. Therefore,$Al_2O_3$ remains insoluble in water.

Alumina $(Al_2O_3)$ is insoluble in water because

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