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pH‐Static Techniques in Volumetric Analysis I.
Author(s) -
Maccà Carlo,
Soldà Lidia
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200201)14:1<57::aid-elan57>3.0.co;2-g
Subject(s) - titration , potentiometric titration , gran plot , ionic strength , chemistry , titration curve , electrolyte , amperometric titration , base (topology) , analytical chemistry (journal) , buffer solution , buffer (optical fiber) , inert , inorganic chemistry , chromatography , mathematics , aqueous solution , computer science , organic chemistry , mathematical analysis , telecommunications , electrode
The pH‐static option available in many potentiometric titrators can be exploited for acid‐base titrations. The procedure consists of continuous or stepwise addition of the titrand solution to a suitable supporting solution (containing an inert electrolyte and, if necessary, a small concentration of buffer), and simultaneous addition of titrant to keep the measured pH at an appropriate constant value. Titrations of moderately concentrated strong and weak acids and bases are theoretically investigated. The criteria of choice of the experimental parameters, particularly of operating pH, ionic strength and buffer power of the measured solution, are discussed. The way these parameters affect the accuracy and the precision of the results is examined. It is inferred that pH‐static titrations can be competitive with traditional titration procedures, particularly for the determination of the effective strength of secondary standard solutions of strong bases. Moreover, they can be used straightforwardly for the determination of acidity constants.