by G. Mallika Devi, D. A. Padmavathi, R. Sanjeev and V. Jagannadham
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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