Tetraethylammonium chloride monohydrate is widely used in biochemical research as a potassium channel blocker. It helps in studying the function and regulation of potassium channels in various cell types, which is crucial for understanding cellular processes and developing treatments for diseases related to ion channel dysfunction. In organic synthesis, it serves as a phase-transfer catalyst, facilitating reactions between compounds in different phases, thereby improving reaction efficiency and yield. Additionally, it is employed in analytical chemistry as an ion-pairing agent to enhance the separation and detection of charged molecules in techniques like liquid chromatography. It is also utilized as a supporting electrolyte in electrochemical experiments. Its role in these applications makes it a valuable tool in both research and industrial settings.