Final answer:
The greater solubility of a substance in an inorganic solvent at higher temperatures is primarily due to the increase in entropy. As temperature increases, molecules move more energetically, enhancing solute dispersion, thus solubility increases.
Step-by-step explanation:
The question you've asked is why a bigger concentration of a soluble substance generally dissolves in an inorganic solvent at higher temperatures. The answer to this is b) Increased entropy. In the context of solubility and temperature, the solubility of a substance usually increases with temperature due to the increase in entropy.
This increase in entropy is associated with the degree to which thermal kinetic energy is distributed throughout the system. As temperature increases, the solvent molecules move faster, leading to more energetic collisions with the solute, resulting in an increased rate of dissolution and the capacity to dissolve more solute.
However, the solubility of gases like HCl, NH₃, and SO₂ decreases as the temperature rises. In these cases, the higher kinetic energy at raised temperatures gives the gas molecules a greater tendency to escape from the solution back into the gas phase. For solid solutes, the endotheric dissolution process consumes heat, increasing internal energy and spreading the solute molecules throughout the solution, which results in increased entropy and consequently increased solubility.