A kinetic and thermodynamic study of the proton transfer equilibria in the 3,5-dinitro-2-hydroxybenzoic acid (DNSA)/ammonia system with different added electrolytes has been undertaken. A common mechanism has been proposed for the proton transfer relaxation pathways involving DNSA as a proton donor/acceptor and water or ammonia as the other donor/acceptor couple. The rate constants are highly dependent on the nature of the anion of the added electrolyte. The results with the organic anions oxalate, propionate, and acetate are particularly noticeable, since no chemical relaxation is observed but just the expected increase in the absorbance of the solution due to the temperature jump. A reasonable explanation for this effect is given on the basis of the intermolecular hydrogen bond between these organic anions and DNSA. The salt effects observed in this work could be of interest in relation to molecular electronics, since in electronic circuits the different elements are subjected to electric and magnetic fields.