Consider the molecule, pentanoic acid which has a pka of 4.81: Hy C OH a. Draw the predominate structure at each of the following pH values. (6 points) i. 11.75 ii. 4.81 iii. 2.95 b. At each of the following pH values, will the structure be charged or uncharged? (3 points) i. 11.75 ii. 4.81 iii. 2.95 Calculate the conjugate base to acid ratio at each of the following pH values. (6 points) i. 11.75 ii. 4.81 iii. 2.95 2. Calculate the pH for each of the following concentrations. (6 points) a. 3.45 x 10-3 b. 5 x 10-3 c. 7.9 x 104 3. Consider the following reaction at equilibrium. C(s) + H,O (g) + Heat = Co (g) + H, (g) a. Is this reaction endothermic or exothermic? (1 point) b. In which direction (right or left) will the equilibrium shift if the following stresses are applied to the reaction at equilibrium? (4 points) i. Remove heat ii. Add CO (g) iii. Remove H2O (g) iv. Add Hz (g) 4. Answer the questions about the two following amino acids: a. Place a star next to each chiral carbon in each amino acid. (2 points) NH2 NH 2 b. Circle and identify the functional group in each of the amino acids' side group. (2 points) H,N NH , c. Write each of the two different dipeptides that form from the condensation reaction between these two.

pur-new-sol

Related Questions