Salt bridge

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Sydney Tay 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:20 am

Salt bridge

Postby Sydney Tay 2B » Mon Feb 25, 2019 9:05 pm

How do we determine which ions are moving across the salt bridge and in what direction they are moving?

Elizabeth Gallmeister 1A
Posts: 41
Joined: Fri Sep 28, 2018 12:21 am

Re: Salt bridge

Postby Elizabeth Gallmeister 1A » Mon Feb 25, 2019 9:22 pm

The ions moving across the salt bridge travel in the opposite direction of the electrons. So, if electrons travel from left (anode) to cathode (right), then the ions will move from cathode to anode.

Jayasuriya Senthilvelan 4I
Posts: 31
Joined: Thu Jan 10, 2019 12:17 am

Re: Salt bridge

Postby Jayasuriya Senthilvelan 4I » Mon Feb 25, 2019 9:27 pm

Electrons travel from the anode to the cathode. So eventually, there will be to many electrons in the cathode, and there will be resistance to electron flow (because electrons don't like moving toward negative charge). This is when the salt bridge comes into action. The salt bridge will release positive ions to the cathode (because the cathode now has a overload of electrons) and negative ions to the anode (because the anode with time will lose a lot of electrons). This will restore the charge of the anode as negative and cathode as positive, and allow the galvanic cell to function for some time.

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