Write the answer of substantiate lithium fluoride has the lowest solubility among group one metal fluorides
Answers
We know that, when hydration energy > lattice energy then compound will soluble in water.
In LiF, due to the small size of fluoride ion, the lattice energy of LiF is higher than it's hydration energy. So LiF is insoluble in water.
Explanation:
It is known that higher is the lattice energy as compared to hydration energy of a compound less will be its solubility .
Since, lithium fluoride is an ionic compound but due to smaller size of fluoride ion and high electronegativity there is strong bonding between lithium and fluoride ion.
So, in order to break this bond we need to provide a very high amount of energy and upon breaking of this bond LiF will become soluble.
Therefore, we can conclude that lithium fluoride has the lowest solubility among group one metal fluorides because lattice energy of LiF is greater than its hydration energy.