Filter Paper Salt Bridge in Potentiometric Titrations: An Undergraduate Laboratory Chemical Education Article

G. Mallika Devi¹, D. A. Padmavathi¹, R. Sanjeev² and V. Jagannadham^1,

¹Department of Chemistry, Osmania University, Hyderabad-500007, India

²Department of Chemistry, Geethanjali College of Engineering and Technology, Cheeryala, Rangareddy Dist., Telangana, India

Cite this paper

G. Mallika Devi, D. A. Padmavathi, R. Sanjeev and V. Jagannadham. Filter Paper Salt Bridge in Potentiometric Titrations: An Undergraduate Laboratory Chemical Education Article. World Journal of Chemical Education. 2016; 4(6):117-123. doi: 10.12691/WJCE-4-6-1

Abstract

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 (Cr₂O₇^2-), 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.

Keywords

salt bridge, Filter paper salt bridge, Potentionmetric titrations

Copyright

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References

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