CHE 132 Lecture Notes - Lecture 34: Electrochemical Cell, Electrochemistry, Standard Hydrogen Electrode

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Che 132 lecture 31: electrochemistry continued: electrochemical cells (voltaic cells. Anions have to migrate into the anode compartment to maintain the charge neutrality: on the cathode compartment cu2+ are consumed by the reduction reactions. In the left (anode) compartment the oxidation takes place: h2 (g) h+ (aq) It is convenient to tabulate cell voltages when reactants and products in the reaction are in standard conditions: pure solids, pure liquids, pure gases, pressure 1 bar, solutes at 1 mol l 1 concentrations. In such conditions voltages are referred to as standard voltages. By definition cell voltages for product favored reactions are positive. 0 > 0 (for a product-favored reaction: ecell, we can think of the standard cell voltage as the result of the standard voltages of the half cells. 0: ecell, e0 (cathode) and e0 (anode) are the standard voltages of the half-reactions. 0 - eanode written as reductions: only electrostatic potential differences can be measured; e0 (cathode) and.

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