Anode is in the negative side (left side of the diagram)
▪ Anode → oxidation
▪ oxidation half-reaction happens in the anode solution
▪ losing electrons → becoming more positive → anode dissolves away
Cathode is in the positive side (right side of the diagram)
▪ Cathode → reduction
▪ reduction half-reaction happens in the anode solution
▪ gaining electrons → becoming more negative → solids is deposited in the surface
Animation-Analysis of Copper-Zinc Voltaic Cell
Some oxidation-reduction reactions are spontaneous, and the energy released by them can be used for electrical work. This principle is used in the working of a voltaic cell Voic cells, or electrochemical cells, make use of the electrons that are transferred from the species that releases electrons and undergoes oxidation to the species that accepts electrons and undergoes reduction. It is possible by any means to separate the oxidation reaction and the reduction reaction and then connect them externally so that the electrons flow from one compartment to the other, you can construct an electrochemical cell.
Watch the video that describes the cell reaction and the cell components of a voltaic cell:
In a copper-zinc voltaic cell, one half-cell consists of a Zn electrode inserted in a solution of zinc suitate and the other half-cell consists of a Cu electrode inserted in a copper sulfate solution. These two hall-cells are separated by a salt bridge.
At the zinc electrode (anode), Zn metal undergoes oxidation by losing two electrons and enters the solution as Zn2+ ions. The oxidation half-cell reaction that takes place at the anode is
Zn(s) → Zn2+(aq) + 2 e-
The Cu ions undergo reduction by accepting two electrons from the copper electrode (cathode) and depositing on the electrode as Cu(s). The reduction hall-cell reaction that takes place at the cathode is
Cu2+(aq) + 2e- → Cu(s)
The electrons lost by the Zn metal are gained by the Cu ion. The transfer of electrons between Zn metal and Cu ions is made possible by connecting the wire between the Zn electrode and the Cu electrode. Thus, in the voltaic cell, the electrons flow through an external circuit from the anode to the cathode. For a voltaic cell to work, the solution in the two half-cells must remain electrically neutral. This can happen only if the flow of ions is countered with the flow of electrons. The flow of ions is made possible with the use of a salt bridge. A salt bridge is a solution of some other metal that has common ions. If a copper-zinc voltaic cell utilizes ZnSO4 and CuSO4 solution, you will use a saturated Na2SO4 solution in the salt bridge. Thus, the salt bridge will help the migration of ions across the two compartments or two half-cells.
Part A. Label the diagram according to the components and processes of a voltaic cell. Drag the appropriate labels to their respective targets.
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