Saturated calomel electrode (SCE)/ Secondary reference electrode

This video describes the construction of saturated calomel electrode (SCE). It discusses the reactions involved when it acts as anode and cathode. It explains the working of saturated calomel electrode. This video explains the calculation of single electrode potential of other electrodes using saturated calomel electrode (SCE) It also lists the advantages and disadvantages of saturated calomel electrode (SCE).
Saturated calomel electrode (SCE), Metal-metal sparingly soluble ion saltConstruction.
Secondary reference electrode - It is a secondary reference electrode, as it can be used to determine the standard electrode potentials of various electrodes.
Half cell reactions
When it acts as anode:
Hg gets oxidised to form Hg22+ ions and releases electrons. Hg22+ ions combines with Cl- to form mercurous chloride (Hg2Cl2).
Electrode representation/Half cell representation
When it acts as cathode:
Mercurous chloride (Hg2Cl2) dissociates to form Hg22+ and Cl- ions. Hg22+ ions gains electrons and gets reduced to Hg.
Advantages of saturated calomel electrode
Advantages of SCE
Advantages of calomel electrode
The standard electrode potential is ‘0.2422 V’. Hence, in the determination of single electrode potential of an unknown electrode using SCE as the reference electrode.
It is cheap, compact and easy to transport.
It’s electrode potential is constant and easily reproducible.
Easy to construct and maintain the cell.
Limitations/Drawbacks of SCE
Limitations/Drawbacks of saturated calomel electrode
Limitations/Drawbacks of calomel electrode

[@DarkOceanShark]

Thank you for uploading this wonderful video ma'am! This is the first time I saw the calomel electrode's sidearm being used as the salt bridge.

[@RevathiPurushothaman]

Most welcome. Is my pleasure.

[@spyy7804]

Best out of all I searched.... ❤thnk uh

[@RevathiPurushothaman]

Thank you very much.

[@Extensors]

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[@RevathiPurushothaman]

Thank you. Already video on ion exchange process of external water softening is available.link: ruclips.net/video/ctlHNf1s6RM/видео.html. There are many videos on water technology. Check inside the channel.

[@Extensors]

@@RevathiPurushothaman thank u so much ma'am 🙏

[@rachanashetty109]

Amezing notes mam

[@RevathiPurushothaman]

Thank you.

[@gs6768]

Super 👌 understand

[@RevathiPurushothaman]

Thank you so much.

[@sireeshakotha1804]

Thank you for uploading this wonderful videos mam .can you upload polymer chemistry...

[@RevathiPurushothaman]

It's my pleasure. Sure.

[@afrojsayyad786]

No new one video posted since four months, are you fine Mam?

[@RevathiPurushothaman]

Thanks for your care. I am fine. I will start posting from this weekend or next week.

[@sakhinachejarla1444]

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[@RevathiPurushothaman]

Yes. Thank you.

[@rachanashetty109]

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[@nanotechnology107]

Mam , what is the difference between primary and secondary reference electrode?

[@RevathiPurushothaman]

Primary reference electrode is SHE where it is very accurate and used to determine the single electrode potential of all the other metal electrodes. The standard potential values are available in literature. But the potential values measured using secondary electrodes such as SCE, depends on the concentration of KCl, which will change with usage and time. Since setting up SHE in labs is difficult we use secondary electrodes.

[@nanotechnology107]

@@RevathiPurushothaman mam what is your field of specialization???

[@nanotechnology107]

@@RevathiPurushothaman analytical chemistry?

[@RevathiPurushothaman]

I teach chemistry. All fields. I even reach analytical techniques. My area of specialization is polymer chemistry.

[@nanotechnology107]

@@RevathiPurushothaman I am analytical chemistry.