Antimony electrode
- how ph is determined using quinhydrone electrode
- how the ph of solution is determined using quinhydrone electrode
- determination of ph using quinhydrone electrode
- what is quinhydrone electrode
Primary reference electrode!
Quinhydrone electrode
The quinhydrone electrode may be used to measure the hydrogen ion concentration (pH) of a solution containing an acidic substance.[1][2]
Principles and operation
[edit]Quinones form a quinhydrone cocrystal by formation of hydrogen bonding between ρ-quinone and ρ-hydroquinone.[3] An equimolar mixture of ρ-quinones and ρ-hydroquinone in contact with an inert metallic electrode, such as antimony, forms what is known as a quinhydrone electrode.
Glass electrode
Such devices can be used to measure the pH of solutions.[4] Quinhydrone electrodes provide fast response times and high accuracy. However, it can only measure pH in the range of 1 to 9 and the solution must not contain a strong oxidizing or reducing agent.
A platinum wire electrode is immersed in a saturated aqueous solution of quinhydrone, in which there is the following equilibrium
- C
6H
6O
2 ⇌ C
6H
4O
2 + 2H+ +2e−.
The potential difference between the platinum electrode and a reference electrode is dependent on the activity, , of hydrogen ions
- how does the ph electrode work
- determination of ph using hydrogen electrode