Direction of flow

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Jorja De Jesus 2C
Posts: 121
Joined: Sat Jul 20, 2019 12:15 am

Direction of flow

Postby Jorja De Jesus 2C » Sun Mar 01, 2020 11:08 pm

If batteries are designed to flow in one direction, are galvanic cells the same? Can electrons only flow in one direction or can they go both ways? Does the salt bridge make it go both ways?

805394719
Posts: 104
Joined: Wed Sep 11, 2019 12:16 am

Re: Direction of flow

Postby 805394719 » Sun Mar 01, 2020 11:14 pm

I think the electrons can only flow from the anode to the cathode since oxidation always takes place in the anode and reduction in the cathode. The salt bridge exists to counteract the charge imbalance created by the one-way flow of the electrons. If the electrons could flow both ways, there would be no charge difference since the electron would be attracted to whichever side was positive and repelled by the negative. The salt bridge provides the charged ions to both solutions to maintain the positive and negative charge balance on both sides. This keeps both solutions neutral by preventing the repulsion of the electrons by the cathode which is building up negative charges due to the electrons it receives.

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

Re: Direction of flow

Postby Ariana Iranmahboub1G » Sun Mar 01, 2020 11:16 pm

In galvanic cells, electrons do only flow in one direction. The salt bridge is used to allow ion transfer in order for two solutions to remain neutral, so I don't think electrons can flow both ways.

Jielena_Bragasin2G
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Re: Direction of flow

Postby Jielena_Bragasin2G » Sun Mar 01, 2020 11:17 pm

When batteries are being "charged" you are forcing the flow of the electrons to go the non spontaneous way, towards the anode, by adding a force and leading to a higher Delta G as time proceeds. To "use" this battery, the electrons are allowed to flow the spontaneous way, towards the cathode, without added force and leading to a lower Delta G as time proceeds.

Jesse H 2L
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Re: Direction of flow

Postby Jesse H 2L » Sun Mar 01, 2020 11:21 pm

in a galvanic cell, the electrons flow in the spontaneous direction, and this flow of electrons is how the battery works, and is generally the only direction of flow, (anode to cathode), the salt bridge allows for ionization and keeps the solutions neutral.

Hussain Chharawalla 1G
Posts: 100
Joined: Sat Jul 20, 2019 12:15 am

Re: Direction of flow

Postby Hussain Chharawalla 1G » Sun Mar 01, 2020 11:21 pm

The salt bridge is just used to balance the charge as electrons flow to one side. For electrolytic cells, the reaction occurs in the nonspontaneous direction. For galvanic cells, the reaction occurs in the spontaneous direction.


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