indicator electrode
Quick Summary
An indicator electrode is a type of electrode used in electroanalysis to measure the concentration or activity of a specific chemical species in a solution. It works in conjunction with a reference electrode, which has a constant potential. The potential difference between these two electrodes is measured by a voltmeter, and this difference is directly related to the concentration of the analyte.
There are two main types of indicator electrodes:
* Inert electrodes: These are made of materials like platinum or gold and reflect the potential of the bulk solution.
* Ion-selective electrodes (ISEs): These are designed to respond preferentially to a single chemical species. They use a special membrane that selectively interacts with the analyte. Examples include glass electrodes, commonly used for pH measurements, which respond to hydrogen ions.1
Indicator electrodes are crucial in potentiometry, a common electroanalytical method, and are also used in titrations to detect the endpoint by observing changes in electrical properties.21
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