FAQs on Daniell Cell and Galvanic Cell

Question 1

1. What is a Daniell cell?

Accepted Answer

Ans. A Daniell cell is a type of electrochemical cell that was invented by John Frederic Daniell in 1836. It consists of a copper electrode immersed in a copper sulfate solution and a zinc electrode immersed in a zinc sulfate solution. The two half-cells are connected by a salt bridge, allowing the flow of ions to maintain electrical neutrality. This cell is commonly used as a source of direct current (DC) and was widely used in early telegraphy.

Question 2

2. How does a Daniell cell work?

Accepted Answer

Ans. In a Daniell cell, oxidation takes place at the zinc electrode, where zinc metal is converted into zinc ions and releases electrons. These electrons travel through an external circuit to the copper electrode, where reduction occurs, copper ions gain electrons and are deposited as copper metal. The overall reaction is the transfer of electrons from the zinc electrode to the copper electrode. The salt bridge allows the movement of ions, balancing the charges in the two half-cells and completing the circuit.

Question 3

3. What are the advantages of using a Daniell cell?

Accepted Answer

Ans. The advantages of using a Daniell cell include its relatively stable voltage output, long shelf life, and low cost. It provides a constant voltage over a long period of time, making it suitable for applications that require a steady power supply. The materials used in the cell, such as copper and zinc, are readily available and inexpensive. Additionally, the Daniell cell has a low self-discharge rate, allowing it to be stored for extended periods without losing its capacity.

Question 4

4. What is a galvanic cell?

Accepted Answer

Ans. A galvanic cell, also known as a voltaic cell, is an electrochemical cell that converts chemical energy into electrical energy. It consists of two half-cells, each containing an electrode immersed in an electrolyte solution. The two half-cells are connected by a conductive pathway, allowing the flow of electrons between them. The redox reaction occurring in the cell generates an electric current that can be used to power devices.

Question 5

5. How is a galvanic cell different from a Daniell cell?

Accepted Answer

Ans. A galvanic cell and a Daniell cell are both types of electrochemical cells, but they differ in their specific design and components. The Daniell cell, as described earlier, uses a copper electrode, a zinc electrode, and a copper sulfate and zinc sulfate electrolyte solution. In contrast, a galvanic cell can have various combinations of electrodes and electrolytes depending on the specific application. The Daniell cell is a specific example of a galvanic cell, but not all galvanic cells are Daniell cells.

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