Chemistry 104 Laboratory
	Electrochemical Cell Type
Answer Keys Gen Chem Lab Periodic Table	Two Types of Cells voltaic or galvanic cell spontaneous cell rxn, e.g. Zn + 2H^+ --> Zn^2+ + H2 Ecell is positive energy released as cell operates electrolytic cell non-spontaneous cell reaction, e.g. Zn^2+ + H2 --> Zn + 2H^+ E cell is negative Power source is required to force rxn
	Calculating the Standard Cell Potential (E^ocell)
	For the Rxn: Zn(s) + 2 H^+ (aq) --> Zn^2+(aq) + H2 (g) Look up standard reduction potentials (E^o values) of reactants: 2H^+ + 2e- --> H2 E^ored = 0.000v Zn^2+ + 2e- --> Zn E^ored = -0.763v Convert one reduction to the oxidation that actually occurs in rxn 2H^+ + 2e- --> H2 E^ored = 0.000v Zn --> Zn^2+ + 2e- E^oox = +0.763v Sum the standard (half) potentials to get E^ocell E^ocell = E^ored + E^oox = +0.763v