Asked by: Keenan Pantelakosscience chemistry
Why is a salt bridge necessary in galvanic cells?
Last Updated: 8th January, 2020
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Subsequently, one may also ask, why salt bridge is used in galvanic cell?
A salt bridge, in electrochemistry, is a laboratory device used to connect the oxidation and reduction half-cells of a galvanic cell (voltaic cell), a type of electrochemical cell. It maintains electrical neutrality within the internal circuit, preventing the cell from rapidly running its reaction to equilibrium.
why is a salt bridge used instead of a wire? salt bridge Watch why can a piece of wire not be used instead of a salt bridge? The salt bridge allows flow of ions (charge) to prevent charge build-up in the ionic solutions. A wire could no do that.
Similarly one may ask, why dont electrolytic cells need a salt bridge?
In electrolytic cell you can dip both anode and cathode in the same solution. Then yes, you don't have a salt bridge because you use the same electrolyte. Salt bridge passes ions at a certain rate that is not too high in order to prevent electrolyte mixing. It has to pass ions at a right speed.
What happens when there is no salt bridge?
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.