Potentiometry is an electrochemical technique used to measure the voltage of an electrochemical cell. This method helps determine the concentration of ions in a solution by using a sensitive electrode, known as an ion-selective electrode, which responds to specific ions. The voltage measured is directly related to the ion concentration, allowing for accurate analysis. In potentiometry, a reference electrode is also used to provide a stable voltage against which the ion-selective electrode's potential can be compared. This technique is widely applied in various fields, including environmental monitoring, clinical diagnostics, and food quality control, due to its simplicity and effectiveness.