Page 367 - Thermodynamics of Biochemical Reactions

Redox Reactions 367

TableForm [
Transpose[calcappredpot[co2tot+de:: formate+h20, 2, {5, 6, 7, 8, 9}, {0, -1, .25}]].
Tab1eHeadings-t {{"I=O MI1, llI=O.10 M", ''I=O.25 MI'],
{"pH 5", "pH 6", "pH 7", "pH 8", "pH 9"}}, Tab1eSpacing-t (1, l}]
PH 5 PH 6 PH 7 PH 8 PH 9
1=0 M -0.329401 -0.363036 -0.409451 -0.466274 -0.525697

I=O.lO M -0.329735 -0.365293 -0.414823 -0.472603 -0.532962
I=O.25 M -0.329881 -0.36618 -0.416639 -0.474684 -0.535535
=:
plot1 = Plot [calcappredpot [coltot + de formate + h20, 2, gH, .25],
{pH, 5, 9}, AxesLabel -t {"pHtl, "Era /V")l;

The chemical reaction corresponding with reaction 2 is not affected by ionic strength because zi = NH, and so the table of
apparent reduction potentials can be made more simply;

calcappredpot [co2g+de==formate, { 5,6,7,8,9), .251
2
{-0.372598, -0.402178, -0.431758, -0.461338, -0.490918)

plot2 Plot [calcappredpot [co2g + de =- formate, 2, pH, .25] 8
{pH, 5, 9}, AxesLabel + {lnpHB@, llE1o/V1l}];

-0

-0
-0
-0
-0

TableForm [Transpose [
calcappredpot [pyruvate + co2tot + de == malate + h20, 2, { 5, 6, 7, 8, 9}, { 0, .l, .25}] 1,
TableHeadingsj {{"I=O M", lmI=O.10 MI'. "I=0.25 Man),
{"pH 5". "pH 6", "pH 7", "pH 8", "pH 9")}, Tab1eSpacing-t {I, l}]