The low solubility of LiF in water is due to its high lattice enthalpy whereas the low solubility of CsI is due to smaller hydration enthalpy of its two ions. Two forces determine the extent to which the solution will occur: Since fluoride ion is much smaller in size than chloride ion, the lattice energy of LiF is greater than that of LiCl. LiF has the highest lattice enthalpy and hence is least soluble in water.Further Li+ and F- are hard ions.Favorable hard -hard interaction overcomes solubility.

For the same alkali metal the melting point decreases in the order fluoride > chloride > bromide > iodide because for the same alkali metal ion, the lattice energies decreases as the size of the halide ion increases. Solubility is a result of an interaction between polar water molecules and the ions that make up a crystal. A common threshold to describe something as insoluble is less than 0.1 g per 100 mL of solvent. On the other hand, LiF is almost insoluble in water due to its high lattice enthalpy. Wiki User 2011-09-07 15:19:19.

The term insoluble is often applied to poorly or very poorly soluble compounds. Due to high hydration energy of Li + ion, Lithium halides are soluble in water except LiF which is sparingly soluble due to its high lattice energy. The solubility of a compound in water depends on the balance between lattice energy and hydration energy. Lithium flouride is less soluble because the hydration enthalpy. Because F- is much smaller than Cl-, the lattice energy of LiF is much more negative than LiCl due to the greater force of attraction between oppositely charged ions when they are closer together. A common threshold to describe something as insoluble is less than 0.1 g per 100 mL of solvent. Magnesium has a +2 oxidation state, which is why two hydroxide ions are required to make the compound electrically neutral. Answer and Explanation: Mg(OH) 2 is insoluble in water. LiBr and LiCl are more soluble because of less facored interaction as Br- and Cl- are not hard ions. Oxo-acids are those in which the acidic proton is on a hydroxyl group with an oxo group attached to the same atom e.g., carbonic acid, …

Why Lithium Fluoride is less soluble in water though it is an ionic compound? Other halides of lithium are soluble in ethanol, acetone and ethylacetate; LiCl is soluble in pyridine also. LiF is less soluble in water than KF because 2 See answers Answers aashifking243 Ace; Answer: As a result, both the ions in CsI are less hydrated and have smaller hydration enthalpy, due to which, it is less soluble in water.


This is mainly because of the greater ionic character of LiF as compared to LiCl. This is a list of the solubility rules for ionic solids in water. On the contrary, LiCl is soluble not only in water, but also in acetone. 10.2.3 Salts of Oxo-Acids . Also, there is not much difference between the … Both the ions in LiF are small and heavily hydrated.

The solubility of an ionic compound depends on the balance between the lattice energy of the compound and the hydration energies of its ions.