How can I calibrate a saturated calomel electrode?

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Isaiah Gyan Popular answer

You should obtain another reference electrode you trust and using a regular voltmeter, you can check the validity of your SCE in NaCl. See page 26 of the pdf in the link below. If you can't download it, let me know and I will get it for you.

http://www.basinc.com/mans/epc.pdf

Isaiah Gyan

Qijin Chi

Isaiah has given a correct answer with the simple (or standard) method. In addition, just in case you only have one SCE, then you can also use Ag/AgCl reference electrode or test a well-known redox probe such as ferrocene.

Julio Cesar Bastos Fernandes

Dear Mr. Rahman, maybe you can use a standard cell of Weston (see link: https://en.wikipedia.org/wiki/Weston_cell). This cell presents a ddp of 1.018 Volts, whose value is mantained the same by years. Using a simple circuit with a galvanometer (in attachment) you can measure the potential of calomel electrode. You can also use a pHmeter, but you have to adapt the connector. The construction of Weston cell is not complicated (http://conradhoffman.com/stdcell.htm or http://www.nist.gov/calibrations/upload/mn84.pdf), but you can buy. However, this cell is very stable, therefore may be difficult find it to buy. This is a sugestion. I hope to have helped you. Good lucky.

Chinnapiyan Vedhi

the electrodes of SCE and Pt immersed in 1M KC1 and connect any one digital potentiometer and measure total potential. then you compared with std potential and clear you.

Richard A Durst

I happened to look at the reference that Dr. Gyan suggested, which is a BAS manual, and was surprised to read that NaCl is used in their Ag/AgCl electrodes. Does anyone know why they use this salt rather than the more equitransferent KCl electrolyte as used in most other reference electrodes and salt bridges? I note that BAS uses KCl in their SCE, however.