A titrator is a laboratory instrument used to determine the concentration of a solution. It works by adding a titrant, a solution of known concentration, to a sample solution until a chemical reaction reaches completion. This process is often indicated by a color change or a specific measurement, allowing scientists to calculate the concentration of the unknown solution. Titrators can be manual or automated, with automated versions providing greater precision and ease of use. They are commonly used in various fields, including chemistry, biology, and environmental science, to analyze substances such as acids, bases, and other chemical compounds.