Problem Set 1 for F09 - Problem Set 1 Page 1 of 2 CH 339K...

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CH 339K Problem Set 1 1) Dihydroxyacetone phosphate (DHAP)and Glyceraldehyde-3-Phosphate (G3P) are both intermediates in the metabolic breakdown of glucose. They can be interconverted by the enzyme Triose Phosphate Isomerase . For the conversion of DHAP to G3P, G o = 7.5 kJ/mol a. Calculate Keq and the equilibrium fraction of G3P at 37 o C. b. What is G if [G3P] = 1/100 [DHAP]? 2) A Cl - ion is separated from a Na + ion by a distance of 0.5 nm. What is the interaction energy (in Joules/mole) in a. Water ( ε = 78.54) b. n-Pentane ( ε = 1.84) 3) What is the pH of each of the following unbuffered solutions? a. 0.35 M HCl b. 0.35 M Acetic Acid c. 0.035 M Acetic Acid 4) What is the pH of the following buffer mixtures? a. 1 M Acetic Acid and 0.5 M Sodium Acetate? b. 0.3 M H 3 PO 4 and 0.8 M KH 2 PO 4 ? 5) You want a buffer of pH 7, made using KH 2 PO 4 and Na 2 HPO 4 : a. What is the conjugate acid in this system? What is theconjugate base? b.
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Problem Set 1 for F09 - Problem Set 1 Page 1 of 2 CH 339K...

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