CHE 132 Lecture Notes - Lecture 38: Standard Hydrogen Electrode, Gibbs Free Energy, Reaction Quotient

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 132
• Professor: Fernando Raineri

Document Summary

Che 132 lecture 35: concentration of cells: effect of concentrations on cell potentials, recall the relation between the gibbs free energy change of a reaction in certain initial conditions and the reaction quotient q. 0 (0. 0592v/n) log(q: g = g0 + rt ln(q, ecell = ecell, also remember that ecell = ecathode eanode, the cell potential can be found by the equation above. If you have the standard hydrogen electrode in your reaction, the [h3o+] and ph2 will be canceled out. 0: when we close the circuit: ecell > ecell. 0: as the cell continues to function, [zn2+] increases and [cu2+] decreases, making q bigger and causes ecell to decrease, eventually we reach the condition: ecell 2 = ecell. 0 which happens when q=1: as the cell continues to function q continues to grow, in this regime: ecell 3 < ecell, eventually the cell discharges which occurs when: ecell 4 = 0.