Question

Are all ionic compounds soluble in water?

Answer 1

When the bonds in any compound are formed by transfer of electrons, then they are termed as ionic bonds and the compounds are called ionic compounds. The solubility of these compounds in water depends on the lattice energy and the hydration energy of these compounds, but most of the ionic compounds are soluble in water.

Complete answer:
Chemical compounds are formed by the chemical bonds that hold together the atoms. These bonds can be either formed by the sharing or transfer of valence electrons from one atom to another. The transfer of valence electrons results in the ionic bonds that lead to formation of ionic compounds. Ionic compounds consist of a positive cation and a negative anion. These compounds are a result of the atoms having varying electronegativities. This varying electronegativity creates partial positive and negative charges, which result in the polarity of the molecule.
Water, also being a polar molecule, easily dissolves the ionic compounds due to the ion – dipole interactions. But some ionic compounds do not get dissolved in water. This is because the ionic forces in those molecules are very high, which creates high lattice energy. Due to high lattice energy, the hydration energy decreases that makes those compounds insoluble in water.
Some examples of insoluble ionic compounds are $AgCl,BaS{{O}_{4}},Ca{{F}_{2}}$ etc.
Hence, all ionic compounds are not soluble in water.

Note:
The ionic compounds become soluble as they dissolve like water, so water being dipolar, dissolves ionic polar compounds. The ion – ion interaction becomes weak, then the ion – water molecule interaction comes into action and becomes strong to dissolve the ionic compound, while in case of insoluble compounds, the water and ion interactions are not so strong.