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Automated, high-precision coulometric titrimetry part II. Strong and weak acids and bases

✍ Scribed by Kenneth W. Pratt

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
746 KB
Volume
289
Category
Article
ISSN
0003-2670

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✦ Synopsis

Automated constant-current coulometric acidimetry, based on Faraday's Laws, is uncertain to less than 1 part in 20000 (relative standard deviation) and requires no chemical standardization. It is applicable to strong and weak acids and bases, with bases back-titrated after addition of excess strong acid. Initial setup and sample introduction are the sole manual steps. Assays of HCl, benzoic acid, Na,CO,, and tris(hydroxymethyl)aminomethane are presented. In the endpoint determination procedure, a generalized titration equation yields the theoretical charge remaining to the endpoint before each charge addition. The ratio of the experimental to the theoretical charge for the preceding aliquot corrects for experimental deviations.

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