CHEM 126 Lecture Notes - Lecture 10: Ammonium Chloride, Lead, Reagent
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9 Aug 2020
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What is the purpose of polishing the electrodes prior to using them in the cell, the purpose of polishing the electrodes for approximately 30 seconds with. Scotch brite pad prior to using them in the cell is to remove the thin outer oxide layer. The purpose of a salt bridge is to minimize the junction potential between the solution interface of the two half cells. It is important to put ionic species into the salt bridge that will not be reduced or oxidized in either of the half cells such as alkali cations and halide anions. Also, it is important the charge balance in each half cells facilitated by the ions in the salt bridge occurs at the same rates. The ideal species for a salt bridge depends on their mobility which means its size. Small ions have a higher mobility than larger ions.
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