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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...
Potentiometric measurements of the stoichiometric constants on the seawater pH scale for the dissociation of carbonic acid in seawater (K 1⁎ =[H + ][HCO 3− ]/[CO 2 ] and K 2⁎ =[H + ][CO 32− ]/[HCO 3− ]) have been made as a function of salinity (1 to 50) and temperature (0 to 50 °C). The results have been fitted...
In the oximolysis reaction para-aldoximes K027 and TMB-4 react faster with ATCh than ortho-aldoximes HI-6 and K033. The reaction rate constants at 25°C were 22M −1 min −1 for HI-6 and K033, 230M −1 min −1 for TMB-4 and 306M −1 min −1 for K027. Semi-empirical calculations showed that differences in rates do not origin from different electron density on...
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