Using acetic acid and the reduction of acetate to acetaldehyde as an example, let’s investigate the difference between the “chemical standard state” (Xo or XƟ) and the “biochemical standard state” (Xo' or X'o). Given the following reaction and associated data at T = 298.15 K. a) Calculate ΔfGo' for CH3COOH(aq) and CH3COO-(aq). b) Even though by definition, ΔfGƟ (H+(aq)) = 0 and ΔfGo' (H+(aq)) = 0, these are different physical quantities. What precisely does each represent? c) Calculate the pKa of acetic acid. Gibbs free energy of formation, in units of kjmol-1, at T=298.15K ΔfGƟ ΔfGo' CH3COOH(aq) -396.5 CH3COO-(aq) -369.3 H+(aq) 0 0
Using acetic acid and the reduction of acetate to acetaldehyde as an example, let’s investigate the difference between the “chemical standard state” (Xo or XƟ) and the “biochemical standard state” (Xo' or X'o). Given the following reaction and associated data at T = 298.15 K.
a) Calculate ΔfGo' for CH3COOH(aq) and CH3COO-(aq).
b) Even though by definition, ΔfGƟ (H+(aq)) = 0 and ΔfGo' (H+(aq)) = 0, these are different physical quantities. What precisely does each represent?
c) Calculate the pKa of acetic acid.
Gibbs free energy of formation, in units of kjmol-1, at T=298.15K
ΔfGƟ ΔfGo'
CH3COOH(aq) -396.5
CH3COO-(aq) -369.3
H+(aq) 0 0
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