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- Quinhydrone_electrode abstract "The quinhydrone electrode is a type of redox electrode which can be used to measure the hydrogen ion concentration (pH) of a solution in a chemical experiment. It provides an alternative to the commonly used glass electrode in a pH meter.The electrode consists of an inert metal electrode (usually a platinum wire) in contact with quinhydrone crystals and a water-based solution. Quinhydrone is slightly soluble in water, dissolving to form a mixture of two substances, quinone and hydroquinone, with the two substances present at equal concentration. Each one of the two substances can easily be oxidised or reduced to the other. The potential at the inert electrode depends on the ratio of the activity of two substances (quinone-hydroquinone), and also the hydrogen ion concentration. The electrode half-reaction is:Hydroquinone ↔ Quinone + 2H+ +2e-Because the electrode half-reaction involves hydrogen ions, the electrode potential depends on the activity of hydrogen ions. From the Nernst equation:For practical pH measurement, a second pH independent reference electrode (such as a silver chloride electrode) is also used. This reference electrode does not respond to the pH. The difference between the potential of the two electrodes depends (primarily) on the activity of H+ in the solution. It is this potential difference which is measured and converted to a pH value. The quinhydrone electrode is not reliable above pH 8. It is also unreliable in the presence of strong oxidising or reducing agents, which would disturb the equilibrium between hydroquinone and quinone. It is also subject to errors in solutions containing proteins or high concentrations of salts.[citation needed]Other electrodes commonly used for measuring pH are the glass electrode, the hydrogen electrode, the antimony – antimony oxide electrode, and the ion-sensitive field effect transistor ISFET electrode.".
- Quinhydrone_electrode wikiPageID "9765126".
- Quinhydrone_electrode wikiPageRevisionID "584622211".
- Quinhydrone_electrode hasPhotoCollection Quinhydrone_electrode.
- Quinhydrone_electrode subject Category:Electroanalytical_chemistry_devices.
- Quinhydrone_electrode subject Category:Electrodes.
- Quinhydrone_electrode type Artifact100021939.
- Quinhydrone_electrode type Conductor103088707.
- Quinhydrone_electrode type Device103183080.
- Quinhydrone_electrode type ElectroanalyticalChemistryDevices.
- Quinhydrone_electrode type Electrode103274796.
- Quinhydrone_electrode type Electrodes.
- Quinhydrone_electrode type Instrumentality103575240.
- Quinhydrone_electrode type Object100002684.
- Quinhydrone_electrode type PhysicalEntity100001930.
- Quinhydrone_electrode type Whole100003553.
- Quinhydrone_electrode comment "The quinhydrone electrode is a type of redox electrode which can be used to measure the hydrogen ion concentration (pH) of a solution in a chemical experiment. It provides an alternative to the commonly used glass electrode in a pH meter.The electrode consists of an inert metal electrode (usually a platinum wire) in contact with quinhydrone crystals and a water-based solution.".
- Quinhydrone_electrode label "Elektroda chinhydronowa".
- Quinhydrone_electrode label "Quinhydrone electrode".
- Quinhydrone_electrode sameAs Elektroda_chinhydronowa.
- Quinhydrone_electrode sameAs m.02prhv3.
- Quinhydrone_electrode sameAs Q7272230.
- Quinhydrone_electrode sameAs Q7272230.
- Quinhydrone_electrode sameAs Quinhydrone_electrode.
- Quinhydrone_electrode wasDerivedFrom Quinhydrone_electrode?oldid=584622211.
- Quinhydrone_electrode isPrimaryTopicOf Quinhydrone_electrode.