Potentiometric titration of diprotic systems |
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Authors: | G Pezzatini G Loglio S Becagli |
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Institution: | (1) Dipt Chimica, Univ. Firenze, Via G. Capponi 9, I-50121 Firenze, Italy, IT;(2) Dipt. Chimica Organica “U. Schiff”, Univ. Firenze, Via G. Capponi 9, I-50121 Firenze, Italy, IT |
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Abstract: | The approximate nature of Gran’s method of linearization of potentiometric titration curves applied to diprotic systems has
been thoroughly investigated. A function involving pH and titrant volume V (which is linearly dependent on V and becomes zero
at the first equivalent point of titration of a weak diprotic base with a strong monoprotic acid) has been critically examined
and validated by means of widely extended simulated experiments. Accurate experimental confirmation of the theoretical expressions
has been obtained by performing many real titrations of the primary standard Na2CO3 with HCl. This particular application, analytically significant itself, can be a prototype of analogous applications.
Received: 25 March 1996/Revised: 15 November 1996/Accepted: 19 November 1996 |
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