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Standard free energy

pegasus10
in Biochemistry and Molecular Biology

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Hello, I was wondering if there is a difference between the value of deltaG° and deltaG°' (with the apex; referring to pH=7 and [Mg2+]=1mM) for a given reaction. For example, the reaction ATP + H2O = ADP + Pi has a deltaG°' of -30.5 kJ/mol (Lehninger), but what is the value of deltaG° for this reaction? Thanks in advance!

At pH 0 (where protons are 1 M in concentration) ATP, ADP, and Pi will all have very different protonation states than they do at pH 7.  I am not sure what the value of deltaG° will be, but I am fairly certain that it will be different.

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