... .5oC; V.P. 53Pa (160oC). Solubility (25oC),620mg/l water; soluble in aqueous alkali, alcohol, diethyl ether.Insoluble in petroleum oil ... . It is a strong acid,pKa2.64, and forms water-soluble salts with alkali metals or aminesc) CorrosiveApplications: 2,4-D, its ... salts and esters are systemic herbicides, widely usedfor the control of ...