Salt bridge

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Tinisha 1G
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Joined: Fri Sep 28, 2018 12:17 am

Salt bridge

Postby Tinisha 1G » Fri Mar 15, 2019 11:34 pm

Can someone explain what ions would affect the salt bridge?

Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Salt bridge

Postby skyeblee2F » Fri Mar 15, 2019 11:51 pm

The electrolytes in a salt bridge need to be relatively unreactive with other chemicals in the cell and have cations and anions with similar migratory speed. KCl is often used because the ions K+ and Cl- are similar in size and transport numbers (.49 and .40, respectively). During the long time of operation KCl maintains a better balance of ions within the electrochemical cell than say, NaCl, in which the two differently sized ions would move at different speeds.

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