Ethylenediamine dihydrochloride is widely used in organic synthesis as a reagent for the preparation of various chemical compounds. It serves as a key intermediate in the production of pharmaceuticals, particularly in the synthesis of antihistamines and other therapeutic agents. In biochemical research, it is utilized as a buffering agent to maintain stable pH conditions in experiments. Additionally, it finds application in the manufacturing of dyes, where it acts as a stabilizer or precursor. In industrial settings, it is employed in water treatment processes to control microbial growth and in the formulation of corrosion inhibitors for metal surfaces. Its chelating properties also make it useful in analytical chemistry for complexometric titrations.