Question

The ionic compounds $BaS{O}_4$ insoluble in water due to:

Answer 1

Hint: We know that Barium sulphate is an inorganic compound which is an alkaline and divalent metal. It is non-toxic in nature. It is white in colour with odourless powder. It has poor solubility in the universal solvent water and to be soluble in water the component lattice energy should be less than its hydration energy.

Complete answer:
The concept of hydration energy with solubility is that the component is soluble in water if the hydration energy of the solution is more than its lattice energy. Barium sulphate is insoluble in water because it has high lattice energy. On adding water in barium sulphate its hydration energy decreases more rapidly in comparison to its lattice energy.
The basic metals of group $II$ of the periodic table are known as the alkaline earth metals. The word earth was proposed to highlight the fact that the oxides of these metals are insoluble in water and are resistant to heat. These include beryllium, magnesium, calcium, strontium, barium and radium. These metals are reactive at normal temperature and pressure. They have two valence electrons and they readily lose these electrons to gain noble gas configuration.
Therefore, the ionic compound $BaS{O}_4$ is insoluble in water due to high lattice energy and low hydration energy. Lower the lattice energy and higher the hydration energy more is the solubility.

Note:
Remember that barium is a white liquid which is used for examining x-ray reports. Barium is not harmful for the human body as it passes through the digestive system. Whereas barium sulphate may cause high heart rate, stomach problems, weakness and pale skin. It is also used in oil well drilling.