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CHEMISTRY 1 220L ELECTROCHEMISTRY 2. Complete the following table for the indicated half-cell combinations at standard conditions: Couples Which metal is the anode? Which metal is the cathode? Toward What would which metal the potential do the be under electrons flow? conditions? standard Cu/Cut, Ag/Ag Zn/Zn2+, Pb/Pb2+ Pb/Pb , Mg/Mg Mg/Mg2+, Ag/Agt 3. Compare the potentials you mcasured between the Ag/Ag and Cu/Cu2+ half-cells before and after adding excess NH..to the Cu/Cu?half-cell . Did the potential increase or decrease? Explain the result in terms of the Nernst equation. 4. Compare the potentials you measured between the Zn/Zn2+ and Cu/Cu2+ half-cells before and after adding excess NH, to chc Cu/Cu2+ half-cell. Did the potential increase or decrease? Explain the result in terms of the Nernst equation. 179