Title: salt bridge
Long Title: IUPAC Gold Book - salt bridge
DOI: 10.1351/goldbook.09080
Status: current

Definition
Means of making electrolytic connection between two half cells without introducing a significant liquid junction potential.

Note
A typical construction is a tube of an inert material (e.g. agar agar) filled with a solution containing an electrolyte with approximately equal ion mobilities of the cation and the anion (e.g., \(\ce{KNO3}\), \(\ce{KCl}\)), with the ends of the tube immersed in the electrolyte solution of the half cells.

Source
- PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 654 (https://doi.org/10.1515/pac-2018-0109)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09080/html
- json: https://goldbook.iupac.org/terms/view/09080/json
- xml: https://goldbook.iupac.org/terms/view/09080/xml

Citation: Citation: 'salt bridge' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09080
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Accessed: 2026-06-11T22:24:48+00:00