Ace Your TAMU CHEM107 Exam 2: Practice Guide

During the process of dilution, the volume of the solution increases by adding more solvent, such as water, to the solution. While the total volume of the solution increases, the amount of solute—the substance being dissolved—does not change. Consequently, the concentration of the solute decreases because concentration is defined as the amount of solute per unit volume of solution. When you dilute a solution, you're spreading the same amount of solute over a larger volume, which leads to a lower concentration. This concept is integral in various applications, particularly in chemistry, where precise concentrations are critical for reactions and calculations. Thus, the correct answer highlights that while the amount of solute remains constant, the concentration decreases due to the increase in total solution volume.