Amberlite IR120 is widely used in water softening processes, where it effectively removes calcium and magnesium ions from hard water, preventing scale formation in pipes and appliances. In the chemical industry, it serves as a catalyst in various organic reactions, including esterification and hydrolysis, due to its strong acidic properties. It is also employed in the purification and separation of metals, such as recovering valuable metals from industrial waste streams. Additionally, Amberlite IR120 finds application in the pharmaceutical industry for purifying and isolating active ingredients during drug manufacturing. Its ability to exchange ions makes it a valuable tool in analytical chemistry for sample preparation and chromatography.