Upon completion of this topic, learners will be able to:

• define Voltaic cell and salt bridge;
• define electrode potential and cell potential;
• construct Zn-Cu Voltaic cell;
• measure the cell potential of Zn-Cu cell using a voltmeter;
• explain how standard electrode potential is measured;
• describe the reactivity of a metal from its position in the activity series;
• calculate cell potential;
• decide whether a given redox reaction is spontaneous or not;
• explain the effect of concentration on cell potential;

The next sections describe battery cells, or voltaic cells (also called galvanic cells). These are kinds of electrochemical cell. An electrochemical cell is a system consisting of electrodes that are dipped into an electrolyte and in which a chemical reaction either uses or generates an electric current. A voltaic, or galvanic, cell is an electrochemical cell in which a spontaneous reaction generates an electric current. In the next sections, we will discuss the basic principles behind voltaic cells and then explore some of their commercial uses.

Explain the uses of a salt bridge?

Every Galvanic cell has an oxidation half-reaction and a reduction half-reaction. The compartments in which these reactions occur are referred to as half-cells.

What are the anode and the cathode in a Galvanic cell?

The electrode where oxidation takes place is called the anode, and the electrode where reduction takes place is the cathode. In the Daniell cell, the zinc electrode is the anode and the copper electrode is the cathode.