2,4,5-Trichlorobenzenesulfonic acid sodium salt is a sodium salt derived from 2,4,5-trichlorobenzenesulfonic acid. It features three chlorine atoms positioned at the 2, 4, and 5 positions on a benzene ring, along with a sulfonic acid group (-SO₃H). This compound appears as a white crystalline powder, soluble in water, and its unique structure imparts significant chemical reactivity. It has found applications primarily in the pharmaceutical and agrochemical industries, serving as an important intermediate for various synthetic processes.