Hg/HgO Reference Electrode

Product Description

Designed for alkaline electrolytes, the Hg/HgO reference electrode provides a stable potential in KOH/NaOH media—ideal for water electrolysis, fuel cell anodes/cathodes, and alkaline battery research. The electrode (Hg/HgO/1 M KOH) exhibits a typical potential near +0.098 V vs NHE at 25 °C. Your ScienceGears listing includes practical specs: electrode impedance ≤10 kΩ, junction flow ~1 drop/10 min, and a refillable side port for maintaining the 1 M KOH salt bridge. Usage notes: remove the protective rubber cap before use; ensure no air bubbles in the bridge; keep the salt bridge level above the test solution during measurements; store in alkaline solution and replace the bridge periodically to maintain low impedance.


Alkaline/Mercurous Oxide Reference Electrode is suitable for alkaline solutions

Alkaline/Mercury Oxide Reference Electrode consists of Hg/HgO/1M KOH. It can be used in high alkaline electrolyte solution.
HgO + H2O + 2e = Hg + 2OH-
Eo = 0.098V vs. NHE at 25℃
You may freely change the solution by taking off the side cover.

Specifications
Electrode impedance:≤10KΩ
Potential at 25℃:0.098V
Flow rate at interface: 1drop/10min
Solution in the salt bridge: 1M KOH

Notes:
1. Please take off the rubber cover at the part of the electrode interface when use.
2. There shouldn’t be air bubbles in the solution in salt bridge otherwise the measuring circuit may be blocked. Please remove air bubbles of the tube before first use. (swing the electrode as the thinner portion towards down.)
3. During measurement, the level of solution in salt bridge should be higher than the solution of the sample.
4. Please store the electrode in alkaline solution.
5. Please regularly replace with solution in the salt bridge and clean the internal wall of the electrode.
It is applicable to alkaline solution. The internal solution is 1m KOH solution, and the solution can be added at the side port