Measuring electric potential of a solution as titrant is added
Measurements, first and second derivative in a potentiometric titration.
In analytical chemistry, potentiometric titration is a technique similar to direct titration of a redox reaction. It is a useful means of characterizing an acid. No indicator is used; instead the electric potential is measured across the analyte, typically an electrolyte solution. To do this, two electrodes are used, an indicator electrode (the glass electrode and metal ion indicator electrode) and a reference electrode. Reference electrodes generally used are hydrogen electrodes, calomel electrodes, and silver chloride electrodes. The indicator electrode forms an electrochemical half-cell with the interested ions in the test solution. The reference electrode forms the other half-cell.
The overall electric potential is calculated as
Esol is the potential drop over the test solution between the two electrodes. Ecell is recorded at intervals as the titrant is added. A graph of potential against volume added can be drawn and the end point of the reaction is halfway between the jump in voltage.
Ecell depends on the concentration of the interested ions with which the indicator electrode is in contact. For example, the electrode reaction may be
As the concentration of Mn+ changes, the Ecell changes correspondingly. Thus the potentiometric titration involve measurement of Ecell with the addition of titrant. Types of potentiometric titration include acid–base titration (total alkalinity and total acidity), redox titration (HI/HY and cerate), precipitation titration (halides), and complexometric titration (free EDTA and Antical #5).
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In analytical chemistry, potentiometrictitration is a technique similar to direct titration of a redox reaction. It is a useful means of characterizing...
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Cyanide is quantified by potentiometrictitration, a method widely used in gold mining. It can also be determined by titration with silver ion. Some analyses...
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Determination of Extent and Duration of Supersaturation Using PotentiometricTitration and Correlation to Solid State Properties". Pharmaceutical Research...
parameters. Improved E&C parameters are listed in ECW model. Titration of acids - freeware for data analysis and simulation of potentiometrictitration curves...
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measuring the amount of iodine (mg) bound per 100 mg of starch in a potentiometrictitration and relating the value to the amount bound by an amylose standard...
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