Thermodynamic Dissociation Constants of 2,4-Dichlorophenoxyacetic Acid (2,4-D) and Some Related Plant Growth Regulators.

Abstract
The pK at 25[degree]C determined by conductivity were found to be: 2-chlorobenzoic acid (12.6 [plus or minus] 0.1) 10-4, 4-CPA (9.75 [plus or minus] 0.04) 10-4 MCPA (7.81 [plus or minus] 0.03) 10-4, 2,4-D (12.7 [plus or minus] 0.1) 10-4, 2,4,5-T (14.7 [plus or minus] 0.1) 10-4.