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The dephosphorylation of ATP follows the formula:

ATP4- + H2O --> ADP3- + Pi

Where Pi indicates the phosphate ion, H2PO4

The standard Gibbs free energy for the reaction (delta G'o) = -30.5 kJ/mol, indicating dephosphorylation is spontaneous under standard conditions.


The equilibrium constant for the reaction (Ka) = [ADP][Pi]/[ATP] = 2.0 x 105 moles/L.


REFERENCE:

Cox, M. M., Nelson, D. L. (2008). Lehninger Principles of Biochemistry, Fifth Edition. W. H. Freeman and Company, New York, pp. 528-530.
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