The quinhydrone electrode is not reliable above pH 8.
2.
Impure samples are often dark-colored due to the presence of quinhydrone ( 1 : 1 complex of quinone with hydroquinone ).
3.
The electrode consists of an inert metal electrode ( usually a platinum wire ) in contact with quinhydrone crystals and a water-based solution.
4.
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.
5.
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.
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