Final answer:
The solution level will slightly increase as sugar is dissolved until the solubility limit is reached; after that point, additional sugar will not increase the solution level as it will not dissolve.
Step-by-step explanation:
If each sugar molecule represents a percentage point of sugar dissolved in the solution, the change expected to see in the solution level over time will depend on whether the solution can dissolve more sugar or if it has reached its solubility limit. Until the solubility limit is reached, the solution level may slightly increase as more sugar is added and dissolved. However, once the solubility limit is reached, adding more sugar will not increase the solution level because the excess sugar will not dissolve and instead will just settle at the bottom.
A true solution is one where the mixture is stable, and the sugar, once dissolved, will not settle out. As the solubility limit is approached, continued stirring will no longer result in the dissolution of sugar, which signifies that the solubility limit has been achieved. The solubility of sugar in water is influenced by temperature, wherein higher temperatures increase solubility, allowing more sugar to dissolve before reaching the limit.