What is Electrochemical cell? Write the constraction of Daniell cell with diagram and Net cell reaction.
Answers
Answer:
In a Daniell cell electrons flow from zinc electrode to copper electrode to copper electrode through an external circuit, while metal ions form one half cell to the other through the salt bridge. Here current flows from copper electrode to zinc electrode that is cathode to anode via an external circuit.
Explanation:
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An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions.
Construction of Daniell Cell
It consists of a copper container filled with a concentrated solution of copper sulfate. Inside the container, there is one porous cylindrical pot filled with diluted sulphuric acid, immersed in the concentrated copper sulfate solution. One amalgam zinc rod is immersed in the diluted sulphuric acid in a porous pot. As per property of dilutes electrolyte the sulphuric acid in its diluted form exists with positive hydrogen ions and negative sulfate icons. The sulfate ions come in contact of zinc rod release electrons to the rod and produce zinc sulfate through the oxidation reaction. As a result, the zinc rod becomes negatively charged and behaves as a cathode.
The positive hydrogen ions can cross the porous wall of pot and come in the copper sulfate solution where they join with sulfate ions of copper sulfate electrolyte and form sulphuric acid. The positive copper ions of copper sulfate electrolyte come in contact with the inner wall of the copper container where they take electrons through reduction and become copper atoms and get deposited on the wall.