CHEM 18b Lecture Notes - Lecture 7: Reaction Quotient, Nernst Equation, Reduction Potential
25 Apr 2017
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They all have an r group which can be acidic, basic, or neutral. They all have 2 groups: carboxylic acid group and amino group. Carboxylic group wants to lose an h+ and amino group wants to gain it. Zwitterion is a molecule with positive and negative charges (0 total) Isoelectric point is the ph at which aa has a net charge of zero (zwitterion) Ka1 = (h3o+)(ha) / (h2a+) = x(maa+x) / (maa-x) x= (h3o+) = 10^-ph. Change in temp is just from reaction. No heat can enter or leave the system. In written equation to represent cell one line means electron transfer and double line means salt bridge. The nernst equation relates a cell voltage for nonstandard conditions (e) to a standard cell voltage (eo ), and to the concentrations of reactants and products (expressed as reaction quotient q): Nernst eq: ecell = ecell (0. 0592/n)log q. Q = [cu2+]anode/[cu2+]cath work done by electrons nfe.
