What's the Difference Between ΔGº and ΔG'º?

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SUMMARY

ΔGº represents the standard Gibbs Free Energy change under standard conditions (1 M concentration, 1 atm pressure, 25ºC), while ΔG'º is the standard Gibbs Free Energy change adjusted for biological conditions, particularly pH. The equation ΔG = ΔGº + RTlnQ is utilized to calculate Gibbs Free Energy changes when reactions deviate from standard conditions. The distinction between ΔGº and ΔG'º is crucial for understanding biochemical reactions, especially in physiological contexts.

PREREQUISITES
  • Understanding of Gibbs Free Energy concepts
  • Familiarity with thermodynamic equations
  • Knowledge of standard conditions in chemistry
  • Basic principles of biochemical reactions and pH effects
NEXT STEPS
  • Study the implications of pH on ΔG'º in biochemical reactions
  • Learn about the application of the Gibbs Free Energy equation in non-standard conditions
  • Explore the role of temperature in Gibbs Free Energy calculations
  • Investigate the significance of ΔGº in thermodynamic stability of reactions
USEFUL FOR

Students in chemistry or biochemistry, researchers studying thermodynamics, and professionals involved in metabolic pathway analysis will benefit from this discussion.

jones106
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Hey guys, I'm hung up on the Gibbs Free Energy equations. I know that ?G° is the free energy change under standard conditions (1 M, 1 atm, 25ºC), and that it is characteristic for a given reaction. I think that when a reaction is occurring under conditions that are not standard the equation ?G=?Gº + RTlnQ is used to account for these different conditions (am I correct here?). My problem, however, is with ?G'º (which my textbook also defines as standard free energy change. What is the difference between ?Gº and ?G'º and when do you use which? Does it have something to do with pH? I just can't seem to get this. Any help would be greatly appreciated. Sorry for some reason my delta symbols come out as question marks.

Thank you very much,
Taylor
 
Last edited:
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Could the prime " ' " be used to mean the first derivative?
 
I think the OP needs to give the context, and how his book defines Gº and G'.
 

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