other electrolytes like KCl, HCl, NaOH and many others are also used. what is the main purpose of potassium ferricyanide [K 3 Fe(CN) 6 ]?
Hello Taghazal,,
It is a well-characterised negatively-charged inner-sphere redox 'marker'/'couple' that is sensitive to changes occurring at the electrode surface, allowing these changes to be interrogated. It is normally used with a supporting electrolyte (such as 0.1 M KCl).
Kind regards,
Jules
K3FeCN6 is used typically as an internal standard in aqueous solutions. Although the electrode set-up includes a reference electrode , an internal standard with a well-known redox couple is used as an additional precaution especially when using a quasi-reference electrode.
Hi,
Yes, the ferro/ferri system has a well-known electrochemical behavior and then is used when you want to test a new design of electrochemical cell, to see that is working appropriately. Another common use is as enzymatic mediator since its redox potential is not high, and presents a quasi-reversible behavior (rapid electron transfer). For example, with Glucose oxidase, horseradish peroxidase...
Good luck!
how we calibrate by using potassiumferricyanide and kcl as supporting electrolyte ?
It is one of the most balanced redox couples, where both oxidation and reduction signals are equatable, or in other words anionic current and the cationic current are proportional.
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