Assistant Laboratory Animal Technician Exam 2025 - Complete Practice Test Guide

Diluting a solution involves reducing the concentration of a substance within that solution by adding more solvent, typically a liquid such as water. This process lowers the amount of solute (the substance being dissolved) in relation to the volume of solvent, leading to a weaker concentration. This is commonly done in laboratory settings to prepare solutions for experiments where a specific concentration is required for accurate results.

Recognizing that diluting directly contrasts with concentrating a solution can help clarify why this particular answer is correct. Concentrating a solution means to increase the amount of solute relative to the solvent, which is the opposite of dilution. Furthermore, increasing the temperature of a liquid or changing its state of matter does not refer to the process of dilution; these are distinct physical changes that do not impact the concentration of solute in the solution.