Question

"Decreasing lattice energy favours increased solubility while decreasing hydration energy favours decreased solubility."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Answer 1

The salt with the smaller cation has the higher lattice energy and high lattice energies tend to decrease the solubility of a salt. However, the solvation energy of the cation is also important in determining solubility and small cations tend to have higher solvation energies. High solvation energies tend to increase the solubility of ionic substances.

But decrease in hydration energy favours decreased solubility. Upon dissolving a salt in water, the outermost ions (those at the edge of the lattice) move away from the lattice and become covered with the neighboring water molecules. If the hydration energy is equal to or greater than the lattice energy, then the salt is water-soluble. In salts for which the hydration energy is higher than the lattice energy, solvation occurs with a release of energy in the form of heat.