Adenosine triphosphate, ATP, is used to store energy within biological systems. It releases that energy by losing a terminal phosphate group, Pi, to form adenosine diphosphate, ADP, through the hydrolysis reaction ATP(aq) + H2O(I) → ADP(aq) + Pi(aq) + H+(aq) . The standard reaction Gibbs energy, ΔrGΘ, for the hydrolysis of ATP to ADP is+ 10 kJ mol-1 at 298 K.This assumes that the concentration of hydrogen ions is 1 mol dm-3 . (a) In biochemistry, it is common practice to assume an alternative , and more realistic, standard state for which pH = 7. What is the corresponding standard reaction Gibbs energy, denoted ΔrGΘ, for this biological standardstate? (b) What is the Gibbs energy of reaction in an environment at 37 °C and pH = 7 in which the ATP. ADP. and P; concentrations are all (i) 1.0 mmol dm-3, (ii) 1.0 μmol dm-3 ?
Adenosine triphosphate, ATP, is used to store energy within biological systems. It releases that energy by losing a terminal phosphate group, Pi, to form adenosine diphosphate, ADP, through the hydrolysis reaction ATP(aq) + H2O(I) → ADP(aq) + Pi(aq) + H+(aq) . The standard reaction Gibbs energy, ΔrGΘ, for the hydrolysis of ATP to ADP is+ 10 kJ mol-1 at 298 K.
This assumes that the concentration of hydrogen ions is 1 mol dm-3 . (a) In biochemistry, it is common practice to assume an alternative , and more realistic, standard state for which pH = 7. What is the corresponding standard reaction Gibbs energy, denoted ΔrGΘ, for this biological standard
state? (b) What is the Gibbs energy of reaction in an environment at 37 °C and pH = 7 in which the ATP. ADP. and P; concentrations are all (i) 1.0 mmol dm-3, (ii) 1.0 μmol dm-3 ?
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