What is the function of porous pot in daniell cell ?

The porous pot play two important functions in Daniell Cell.
1) To complete the circuit by let the ions passing through it.
2) To provide a separation between two solutions and prevent it from mixing.
 

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The use of a porous barrier allows ions to pass through but keeps the solutions from mixing. Without this barrier, when no current was drawn the copper ions would drift to the zinc anode and undergo reduction without producing a current, which would destroy the battery's life.

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