2. The standard state in biochemistry is slightly different than in Physical Chemistry. In biochemistry the hydrogen-ion

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2 The Standard State In Biochemistry Is Slightly Different Than In Physical Chemistry In Biochemistry The Hydrogen Ion 1 (46.22 KiB) Viewed 62 times

2. The standard state in biochemistry is slightly different than in Physical Chemistry. In biochemistry the hydrogen-ion concentration for the standard state is 10-7 Mbecause the physiological pH is about 7. Because of this change in the standard state of the concentration of H+, we will employ a slightly different notation for the standard change in Gibbs Free Energy (AG). In practice, this means for a process such as A+xH AB+C the Gibbs Free Energy change using the biochemists standard state is A G = A,GⓇ + RTI (/1M)([C\/1M) ([4/1M)(1+1/1 x 10-7M) (a) NAD+ and NADH are the oxidized and reduced forms of nicotinamide adenine dinucleotide. For the oxidation of NADH NADH+H+NAD + H2; where A,GⓇ = -21.8 kJ mol-. at 298 K. Find the equilibrium constant K using the Physical Chemist standard state at 298 K (b) If the AG is the same regardless of the standard state used (A,Gº or A,Gº'), determine the difference between the two standards states. (e) Determine A Gº for the reaction in question 2 What do you notice in terms of the spontaneity of the reaction? (1) Determine K', the equilibrium constant according to the Biochemist Standard State, at 298 K.