Standard value chemical drive

With a standard value of = 1.25 kG for the transition of a-o- into p-o-glucose at room temperature, a characteristic S-shaped curve is obtained for the dependence of chemical drive upon degree of conversion (Fig. 6.4). 

The mathematical relation becomes rather complicated for reactions with a more complex stoichiometry such as the reaction of Fe " ions with I ions mentioned above. For better overview, it would be advisable in this case to create a kind of table (Table 6.1). For each substance involved, the table lists in the first row the standard value of its chemical potential for calculating the drive of the reaction under standard conditions. In the following, we assume that at the begiiming of the reaction, Fe " and I both have a concentration of Cq and that Fe " and I2 are absent. The concrete values of the initial concentrations of the substances follow in the next row. Finally, the formulas for the concentrations at an arbitrary time t are listed which can be calculated by using the stoichiometry of the reaction, is the density of conversion mentioned above. 

With the standard value of the chemical drive of +33 kG, the corresponding equilibrium number at room temperature is... 

From 34 measurements using an absolutely calibrated mechanical drive the value for A was estimated as 1-7048 0-0025 mm s and the chemical isomer shift relative to the Fe/Cu source was —0-4844 0-0010 mm s". This conflicts with an earlier value of 1-726 0-002 mm s at 23°C established by the National Bureau of Standards in the U.S.A., but a second reinvestigation [40] with many measurements obtained values in the range 1-7078 to... 

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