Describe construction and working of Daniel cell.
Construction:
It consists of zinc electrode dipped in ZnSO4 Solution & Copper electrode dipped in CuSO4 solution.
The two solutions are separated by a porous pot.
The two solutions can seep through the pot & so comes in contact with each other automatically. Thus, porous partition acts as a salt bridge.
Working:- The tendency of Zn to form Zn++ is greater than the tendency of Zn++ to get deposited as Zn on the electrode. Therefore Zn goes into the solution forming Zn++. On the other hand tendency of Copper to go into the solution is less than the tendency of Cu++ to get deposited as Cu & hence copper electrode becomes positively charged. The emf of cell is 1.1 volt.