Which factor does NOT change the final solubility of a salt in water?

The amount of stirring does not affect the final solubility of a salt in water because solubility is primarily determined by the interactions between the solute and the solvent, such as temperature and the chemical nature of both substances involved. Stirring can help to distribute the solute more evenly throughout the solvent and can speed up the process of dissolving by bringing fresh solvent into contact with the solute particles. However, it does not increase the overall solubility limit of the solute in that specific solvent at a given temperature.

In contrast, temperature plays a crucial role in solubility, often increasing it for many salts as temperature rises due to enhanced kinetic energy. The type of solvent is fundamental as different solvents have varying abilities to solvate different solutes, significantly affecting solubility. Additionally, the identity of the solute is vital since different salts have distinct solubility properties based on their chemical structure and interactions with water.