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The isohydricity property, referred to systems composed of acids or bases, is presented. The related isohydricity conditions are formulated for different pairs of solutions. The pH titrations in the system of isohydric solutions are put in context with conductometric titrations. The differences between pK 1 values obtained according to both methods are not too significant and the conductometric...
The isohydricity (pH constancy) principle is referred to the pair of solutions: weak acid (HL, C 0 mol/L) and strong acid (HB, Cmol/L) when mixed e.g., according to titrimetric mode. Such a case takes place if the relation C 0 =C+C 2 ×10pK 1 is valid, where pK 1 =−logK 1 , K 1 – dissociation constant for a weak monoprotic acid HL. This principle,...
The paper provides a new formulation and analytical proposals based on the isohydric solutions concept. It is particularly stated that a mixture formed, according to titrimetric mode, from a weak acid (HX, C 0 mol/L) and a strong acid (HB, Cmol/L) solutions, assumes constant pH, independently on the volumes of the solutions mixed, provided that the relation C 0 =C+C 2 ·10pK...
A new approach to modelling of some binary (hydro-organic, HL/H 2 O+B) acid–base systems with organic co-solvent B fully miscible with water, is suggested and applied for the determination of acidity parameters pK for some weak acids HL. The models are designed to get the pK=pK(x) relationships (x—mole fraction of B in H 2 O+B) from results of pH titrations made in such systems and...
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