Question

Why baso4 is insoluble whereas Beso4 is soluble in water

Answer 1

Hello dear,

● BeSO4 is more soluble than BaO4 because -
- Solubility of salt largely depends on its ionization, size of cation and charge on the ion.
- Smaller cations are more soluble in water.
- Between Be & Ba, Be ion has small ionic size.
- Also BeSO4 has highest hydration enthalpy.
- Therefore, BeSO4 is more soluble than BaSO4.



Hope this helps you...

Answer 2

Barium Sulphate $\left(\mathrm{BaSO}_{4}\right)$ is ‘insoluble in water’ whereas Beryllium Sulphate $\left(BeSO_{4}\right)$ is soluble in water because of the following reasons:

a) Hydration energy of a substance is ‘directly proportional’ to its solubility in water. These factors are also ‘inversely proportional’ to the lattice energy. Higher the lattice energy lesser is the solubility and higher the hydration energy greater is the solubility.  

b) Barium Sulphate has “high lattice energy” because of which it is insoluble in water, whereas Beryllium Sulphate has high hydration energy which makes is soluble in water.