Chem220 - Organic Chemistry
Chapter 3: Acids and Bases: Curved Arrow Notations
Solution Set
Due: Monday, September 26, 2011
Josiah Willard Gibbs (1839-1903) |
J. W. Gibbs - b. New Haven, CT. Awarded 1st US PhD in the sciences (Yale, SSS, 1863). Developed the concept of free energy and the chemical potential. Gibbs spent his entire career at Yale. . G. N. Lewis - b. Weymouth, MA., Professor UCBerkeley. Developed concept of the covalent bond, dot structures and "Lewis" acids and bases. |
Gilbert Newton Lewis (1875-1946) |
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1. With the aid of the pKa table, determine the Keq for each of the following reactions. Place an equilibrium arrow between the second and third structures that reflects the value of Keq, i.e., Explain your results.
2. Determine the Gibbs free energy at 25 oC of the reaction NH2- + H+ -------> NH3. Recall -ΔGo = RT ln Keq (-ΔGo = 2.3RT log Keq), where R = 1.98 cal/mole-oK. The pKa table will be of help.