Volume 4, Issue 6

Filter Paper Salt Bridge in Potentiometric Titrations: An Undergraduate Laboratory Chemical Education Article
Original Research
It is essential in an electrochemistry laboratory to use salt bridge in electrochemical cells while measuring the emf. This provides a means of eliminating “liquid junction potential” between two half cells. It was indicated laconically without any experimental details (https://en.wikipedia.org/wiki/Salt_bridge#cite_ref-1) that the salt bridges can also be made using laboratory filter paper soaking in a suitable inert salt solution. In this article we have made a detailed potentiometric experimental study on four representative titrations viz. strong acid (HCl) versus strong base (NaOH), weak acid (CH3COOH) versus strong base (NaOH), ferrous iron (Fe2+) versus dichromate (Cr2O72-), and chloride ion (Cl-) versus silver ion (Ag+) using filter paper salt bridge and compared the results with those obtained using Agar-Agar salt bridge.
World Journal of Chemical Education. 2016, 4(6), 117-123. DOI: 10.12691/wjce-4-6-1
Pub. Date: November 16, 2016
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