Free energies of reaction form reduction potentials: Oxidation of Lactate with Fe3+.

a)Under standard conditions , will the oxidation of lactate using Fe3+ as electron acceptor prove energetically favorable? What is the change in free energy associated with the complete oxidation of lactate to carbon dioxide by Fe 3+? (Assume reduction of Fe3+ to Fe2+) Given information pe0=-0.68 (My knowledge about this is: pe0=E0/2.3(RT/F)=E0/0.059 and T=298K, F=faraday constant) for the following reaction: 1/12 lactate ion +1/4 water---->1/4 CO2(g)+11/12H+ ion + e- b) How does this energy change compare with the aerobic oxidation of lactate? c) Recompute the free energy change of lactate oxidation by Fe3+ under Non Standard conditions assuming that: [Fe2+]=10^-4 M pH=7 T=2... click for more

Overall free energy change in a non-standard cell.

-438 kJ/mol is the free energy change of lactate oxidation by Fe3+ under non-standard conditions assuming that: C3H5O3- + 12 Fe3+ + 3 H2O -----> 3 CO2 + 11 H+ + 12 Fe2+ [Fe2+]=10^-4 M pH=7 T=25 degree centigrade [lactate]=10^-3 M Carbon dioxide is in equilibrium with atmospheric CO2 Fe3+ is in equilibrium with Fe(OH)3 (s) Note for Fe(OH)3, Ksp=10^-38 Ksp is the equilibrium constant Would the following changes make the overall free-energy change more or less favorblae for the overall reaction described above? (Indicate whether the free energy change is sensitive or insensitive to these differences by calculation of free energies): 1. Raise pH of solution to 8.0 2 ... click for more

Typical High School Chemistry Exam (Kinetics)

Please see the attached file.

Vmax, Km: Calculation of Kinetic Constants, first order

The initial velocity of an enzyme catalyzed reaction was measured at a serious of different initial substrate concentrations in the table. Find Km (sometimes called Ks)(the half velocity constant) and ...there is moreshow problemThe initial velocity of an enzyme catalyzed reaction was measured at a serious of different initial substrate concentrations in the table. Find Km (sometimes called Ks)(the half velocity constant) and max velocity Vmax. Over what substrate concentration rane would you expect reaction to approximately follow first order kinetics (i.e) V=(k first order) [S] and estimate k-first order Units of [S] is M Velocity (V) in micromoles/liter-min 8.35 E-6 ... click for more

Zeta potential?? What is it really??

Dr M: Can you explain zeta potential in simple terms? If you haven't deduced by now, my study mates and I are all Chem Engineering grads from the early 80's and sadly have forgotten much of what we academically one knew....we are all now pursuing Master's degrees and it is a struggle re-learning much of this material. Also...we all work either in pulp & paper mills or other wood product mills as process engineers (hence many of the questions surrounding wood chemistry etc. etc.) I am particularly interested in better understanding zeta potential. The reason I ask is that I'm trying to determine the possible electro-chemical attractive forces between the wood pulp we produce and t... click for more