Henry’s law equilibrium constant

The ratio of the three S(IV)aq species is pH-dependent. It can be calculated from the measured (S02)g by Henry s law equilibrium constant HS02 ancl the we l known first and second ionization constants Kdi and KD2. 

From this model, following the analysis of Hill(54), one may derive theoretical expressions for the Henry s Law equilibrium constant(55,56),... 

Actually, one point is swept under the rug in the discussion above. The value of Ca,. is really not a directly (or at least easily) measured quantity, and normally would be determined from measurement of Ca and use of a Henry s law equilibrium constant H. Thus, the overall analysis will depend on correlations or reported data for the diffusion coefficient, D, the mass transfer coefficient, k, and the Henry s law constant, H. As we have pointed out in many other cases, the individual uncertainties involved in determination of each of these constants can accrue a considerable uncertainty in the final evaluation of. ... 

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