3.4- Dihydroxy-benzoic acid acidity constants

The solvent isotope effect in the decarboxylation of 2,4-dihydroxy-benzoic acid is ( atcoohJhjO /( ArcooD)D,o = 6.25. The solvent isotope effect on the acid ionization constant of 2,4-dihydroxybenzoic acid has been determined separately, by potentiometric methods ... [Pg.76]

The density of charge is nearly constant over the whole range of pH if clay minerals are tested (Fig. 3). The negative charges increase in the order 1,2-dihydroxy-benzene, 4-methylbenzoic acid, benzoic acid, 2-hydroxy-benzoic acid. The change of the charge density strongly... [Pg.141]