Final answer:
The statement is true; the heat of solution for a solid salt is affected by both the lattice energy involved in breaking apart the salt's ionic lattice and the heat of hydration when water molecules attach to the ions.
Step-by-step explanation:
The heat of solution of a solid salt is indeed related to its lattice energy and its heat of hydration. When a salt dissolves in water, the process can be thought of as occurring in two main steps:
- The breakup of the ionic lattice of the solid, which is associated with the lattice energy. This requires a large amount of energy to separate the anions and cations in the salt.
- Attachment of water molecules to the released ions, also known as solvation or hydration, which releases energy.
The net energy change for dissolving the salt is the sum of these two energy terms, which have opposite effects on the solubility of the salt. The lattice energy must be overcome for the salt to dissolve, which would reduce solubility. However, the energy released during hydration can offset this, facilitating the salt's dissolution in water.
Therefore, the statement is a. True, the heat of solution is related to the lattice energy and heat of hydration for a solid salt.