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Chapter 17: Problem 21

Describe the components of an electro- chemical cell.

Short Answer

Expert verified
An electrochemical cell consists of two half cells - an anode where oxidation occurs and a cathode where reduction takes place. Each half cell is composed of an electrode and an electrolyte. The half cells are connected by a salt bridge that balances the positive and negative charges and allows the reaction to continue. Finally, an external circuit connects the two electrodes and allows the flow of electrons.

Step by step solution

01

Identify the Anode and Cathode

In an electrochemical cell, there are two electrodes: the anode and the cathode. The anode is the electrode where oxidation (loss of electrons) happens, while the cathode is where reduction (gain of electrons) takes place. The anode and cathode could be made from different types of metals.
02

Distinguish the Electrolyte

The electrolyte is the substance that makes up the environment around the electrodes. It is usually in a liquid state and contains ions that participate in the redox reaction. In each half-cell, the electrolyte is in contact with its respective electrode (anode or cathode). The electrolyte can be made from a solution of a salt, base, or acid, and must be capable of conducting electricity.
03

Recognize the Salt Bridge or Porous Disk

A salt bridge or porous disk is used to connect the two half cells in the system. The salt bridge allows ions to flow between the two half-cells, serving to balance the positive and negative charges, thus allowing the reaction to continue. The salt bridge usually contains a salt such as potassium nitrate.
04

Understand the External Circuit

An external circuit is the wire or path that connects the two electrodes and where the electrons flow when the oxidation-reduction reaction is allowed to progress. This external circuit is usually connected to a load, like a light bulb, to show the flow of the electric current.

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Most popular questions from this chapter

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