Abstract
Tabe et al. recently argued (on the basis of calculations) that the protonation of trimethylamine (TMA) on the surface of pH ≤ 4 water^2 reflects that TMA is a much weaker base at the surface than in bulk water (pK_(a,TMA) = 9.8) and conjectured that “if another indicator species (X) were used which is less stabilized at the surface than its protonated form (XH+), we would expect an apparently opposite shift of pK_a”. It appears that Tabe et al. have overlooked the experiments we had performed using indicator species covering a wide range of acidity constants, which clearly fail to support their prediction.
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