Why Ag AgCl is used as a reference electrode?
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Silver/silver chloride is a common choice of biological electrodes due to its low half-cell potential of about +222 mV (SHE), low impedance, with a toxicity lower than that of the calomel electrode containing mercury.
How is Ag AgCl reference electrode potential calculated?
The potential of the Ag/AgCl electrode depends on the concentration of the solution used in the electrode itself….
- The general equation for this conversion at any pH using Ag/AgCl reference electrode is:
- E(RHE) = EAg/AgCl + 0.059 pH + EoAg/AgCl.
- Where EoAg/AgCl = 0.1976 V at 25oC and E Ag/AgCl is your working potential.
What is reference electrode describe she?
A reference electrode is an electrode which has a stable and well-known electrode potential. The high stability of the electrode potential is usually reached by employing a redox system with constant (buffered or saturated) concentrations of each participant of the redox reaction.
What is the advantage of Ag AgCl electrode over calomel electrode?
Although Ag/AgCl is not the best reference electrode, but it is more convenient than, for example Calomel, because it can be use as a thin wire which can be placed anywhere in the system without taking a space.
Is AgCl a strong electrolyte?
Even insoluble ionic compounds (e.g., AgCl, PbSO4, CaCO3) are strong electrolytes, because the small amounts that do dissolve in water do so principally as ions; i.e., there is virtually no undissociated form of the compound in solution.
How do you fix an AgCl electrode?
To solve this problem use slightly acidic 7% thiourea and leave your electrode in this solution for several hours to remove the precipitate. 2-Replace KCl 3M with freshly prepared one and ensure that the AgCl in your electrode is immersed in KCl.
How do you turn a girl into potential?
The Standard Hydrogen Electrode (SHE) is considered the primary reference electrode as it defines the zero point in the electrochemical scale….Table 1.
| Name | Half-cell Reaction | Potential (VSHE) |
|---|---|---|
| SSC0.1M | AgCl+e−=Ag+Cl− | +0.2881 |
| SSCsat | AgCl+e−=Ag+Cl− | +0.2224 |
| SHE | 2H++2e−=H2 | +0.0000 |
What is reference electrode 12th class?
It is an electrode whose potential is arbitrarily taken as zero or is exactly known. Standard Hydrogen Electrode (SHE), calomel electrode, silver-silver chloride electrode and glass electrode are some examples of reference electrode.