AI Article Synopsis
- The isohydricity principle relates to mixing weak and strong acids in a controlled way, allowing for the analysis of pH constancy.
- This principle is crucial for accurately determining the dissociation constant (pK(1)) of weak monoprotic acids, confirmed through various solvents and solutions.
- Titration results, analyzed using regression techniques, establish a new precision criterion, with findings aligning closely to existing literature on pK(1) values.
Article Abstract
The isohydricity (pH constancy) principle is referred to the pair of solutions: weak acid (HL, C(0)mol/L) and strong acid (HB, C mol/L) when mixed e.g., according to titrimetric mode. Such a case takes place if the relation C(0)=C+C(2) × 10(pK(1)) is valid, where pK(1)=-log K(1), K(1) - dissociation constant for a weak monoprotic acid HL. This principle, outlined and formulated in earlier paper (Michałowski et al., Talanta 82 (2010) 1965), is the basis for a sensitive method of pK(1) determination, confirmed for a series of weak acids in presence of basal electrolytes or in water+organic solvent (dimethyl sulphoxide, methanol, isopropanol) media. The results of titrations were elaborated according to principles of regression analysis, with use of least squares method. A new criterion for precision of the results obtained according to this method is formulated. The pK(1) values obtained are comparable with ones found in literature.
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| http://dx.doi.org/10.1016/j.talanta.2011.09.002 | DOI Listing |
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