Draw the labelled diagram of Electro-chemical cell and write its structure and chemical reaction.
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In electrochemical cells, oxidation occurs at the anode, and reduction occurs at the cathode. The flow of electrons from the anode to the cathode is what powers the cell.
Step 1: Electrochemical Cell Diagram.
An electrochemical cell consists of two half-cells connected by a salt bridge or a porous barrier. Each half-cell consists of a metal electrode immersed in a solution of its ions. A typical diagram for a Daniell cell is shown below:
\[
\text{Zn (solid)} \vert \text{Zn}^{2+} \, \vert \vert \text{Cu}^{2+} \vert \text{Cu (solid)}
\]
The salt bridge (represented by \(\vert \vert\)) connects the two half-cells, allowing ions to flow and maintain electrical neutrality.
Step 2: Chemical Reaction in the Electrochemical Cell.
The overall chemical reaction in a Daniell cell is:
\[
\text{Zn (solid)} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu (solid)}
\]
Here, zinc undergoes oxidation at the anode (losing electrons), and copper ions are reduced at the cathode (gaining electrons).
