Modelling the diffusion coefficient D for all solvents simultaneously

As an alternative to modelling each solvent individually, an obvious approach is to model all the solvents simultaneously. In order to do this, estimated values for the viscosity tjb were generated using the coefficients given above. The models for D as a function of MB, T, r B, CMR, and D/T as a function of MB, r B, CMR are similar to those found for water alone, but the use of D/T provides smaller standard errors in the coefficients. 

Several approaches are possible, and therefore two examples are given first in order to illustrate some of the possibilities, and then a third, simpler, model is shown. Thus, for the model 

However, three solvent properties seems unnecessary, when CMR0 and Mb are correlated, and therefore considering all solvents simultaneously via a simpler model 

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