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Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged,because of the charge imbalance,the electrode reaction would quickly come to a halt. The two basically have the same purpose
They basically serve the same purpose except that that with the salt bridge, there are two beakers connected with a tube filled with gel that allows the salts to move, whereas with the porous disk, the salts can transport to either side of the disk because it's porous. Salt bridges are represented with double lines and porous disks are represented with single lines. Hope this helps!
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