The precision of spectrophotometric measurements of indicator absorbance ratios is sufficient to allow evaluation of small isotopically induced differences in the dissociation constant of boric acid (KB). The quotient of KB and KB, obtained using isotopically X99% pure borate/boric acid buffers, provides an equilibrium constant for the reaction B(OH)3+ B(OH)4 3B(OH)3+ B(OH)4 which heretofore ha...
