Abstract
The article provides experimental data applied to the determination of carbonate alkalinity (CAM) according to modified Gran II functions. CAM is related to the mixtures NaHCO3 + Na2CO3 and Na2CO3 + NaOH. In addition to the determination of equivalence volumes, one of the main novelties of the proposed method is the possibility of determining the activity coefficient of hydrogen ions (γ). Moreover, CAM can be used to calculate the dissociation constants (K1, K2) for carbonic acid and the ionic product of water (KW) from a single pH titration curve. The parameters of the related functions are calculated according to the least squares method.
Highlights
In the papers [1] [2] published recently, the new approaches to the measurement of total alkalinity (TAL) and carbonate alkalinity (CAM) were presented
carbonate alkalinity in a modified version” (CAM) refers to titrimetric analysis of two systems (V0 mL): NaHCO3 (C01) + Na2CO3 (C02) (System I), and Na2CO3 (C02) + NaOH (Cb) (System II)
The CAM concept is fully compatible with the TAL concept, in which other species with acid-base properties are included
Summary
In the papers [1] [2] published recently, the new approaches to the measurement of total alkalinity (TAL) and carbonate alkalinity (CAM) were presented. The equivalence volumes Veqi (i = 1, 2, 3) referring to the corresponding components in Systems I and II are involved in the following relationships:. The present paper provides a new approach to the problem in question. This approach enables equivalence volumes (Veqi) to be calculated and the following physicochemical data to be evaluated: dissociation constants (K1 and K2) of H2CO3, the ionic product of water (KW), and the activity coefficient (γ) of hydrogen ions— in aqueous media, and in binary-solvent systems [3].
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