Charge Buildup

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Charge Buildup

Postby KDang_1D » Thu Feb 20, 2020 12:24 am

What is meant by "a charge buildup" regarding the salt bridge? Why does this prevent electron transfer?

Rachel Yu 1G
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Joined: Fri Aug 09, 2019 12:15 am

Re: Charge Buildup

Postby Rachel Yu 1G » Thu Feb 20, 2020 12:37 am

In a galvanic cell, electrons flow from the anode to the cathode. In the cathode solution, the electrons bond with the cations. However, this leaves cations in the anode that will gradually increase the charge of the anode solution. A "charge buildup" occurs when the anode solution is so positive that the electrons will no longer flow to the cathode, preventing electron transfer. The purpose of the salt bridge is for the cations of the anode solution to bond with the anions of the salt in order to neutralize the solution. By neutralizing the solution, electron flow will continue.

Max Madrzyk Dis 4G
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Joined: Wed Sep 18, 2019 12:21 am

Re: Charge Buildup

Postby Max Madrzyk Dis 4G » Thu Feb 20, 2020 9:43 am

The electrons flow from the negatively charged anode to the positively charged cathode. So, overtime it makes sense that the electrodes would stop flowing because there would no longer be a difference in charge attracting electrons to either of the sides. Thats why the salt bridge is there, so that the charge difference remains and the reaction can continue to proceed.

Daniel Toscano 1L
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Joined: Tue Nov 13, 2018 12:18 am

Re: Charge Buildup

Postby Daniel Toscano 1L » Thu Feb 20, 2020 10:02 am

A charge buildup in the anode solution means that electrons will no longer transfer from anode to cathode. The salt bridge is used to prevent this charge buildup by neutralizing the anode solution.

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