Apparent equilibrium constant transformed Gibbs energies

CALCULATION OF STANDARD TRANSFORMED GIBBS ENERGIES OF SPECIES FROM EXPERIMENTAL MEASUREMENTS OF APPARENT EQUILIBRIUM CONSTANTS... 

Since tables of standard apparent reduction potentials and standard transformed Gibbs energies of formation contain the same basic information, there is a question as to whether this chapter is really needed. However, the consideration of standard apparent reduction potentials provides a more global view of the driving forces in redox reactions. There are two contributions to the apparent equilibrium constant for a biochemical redox reaction, namely the standard apparent reduction potentials of the two half-reactions. Therefore it is of interest to compare the standard apparent reduction potentials of various half reactions. 

These tables have been given to 0.01 kJ mol-1. In general this overemphasizes the accuracy with which these formation properties are known. However for some reactants for which species are in classical tables, this accuracy is warranted. An error of 0.01 kJ mol-1 in the standard transformed Gibbs energy of a reaction at 298 K corresponds with an error of about 1 % in the value of the apparent equilibrium constant. It is important to understand that the large number of digits in these tables is required because the thermodynamic information is in differences between entries. 

Calculation of the standard transformed Gibbs energies of formation of the species of a reactant from the apparent equilibrium constant of a reaction... 

Since the hydrolysis of ATP evolves heat, Le Chatelier s principle says raising the temperature will cause the reaction to go less far to the right. But at 313 K the transformed Gibbs energy of reaction is more negative. To apply Le Chatelier we have to look at the apparent equilibrium constants. At pH 7 and ionic strength 0, we obtain... 

R. A. Alberty, Effect of temperature on standard transformed Gibbs energies of formation of reactants at specified pH and ionic strength and apparent equilibrium constants of biochemical reactions, J. Phys. Chem. 105 B, 7865-7870 (2001). (Supplementary Information is available.)... 

Use of Matrix Multiplication in Calculating Apparent Equilibrium Constants and of LinearSolve in Calculating Standard Transformed Gibbs Energies of Formation of Reactants... 

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