What is the term for the part of a solution that is dissolved in the liquid?

The term for the part of a solution that is dissolved in the liquid is "solute." In a solution, the solute is the substance that undergoes dissolution, resulting in a homogeneous mixture with the solvent, which is the liquid component of the solution.

In practical terms, when you think about making a saltwater solution, for example, the salt is the solute that dissolves in water, the solvent. This is a fundamental concept in chemistry that underlies many processes, such as drug formulation in pharmacy, where understanding the role of the solute is crucial for creating effective medications. By knowing that the solute interacts with the solvent, one can manipulate concentration, solubility, and other important properties in pharmaceutical preparations.