ISSN:
1572-8927
Schlagwort(e):
Acidity scales
;
pH-metric standards
;
mixed solvents
;
methylcellosolve-water
;
2-methoxyethanol
;
potassium hydrogenphthalate buffer
;
ionization constants
;
o-phthalic acid
;
benzene-1,2-dicarboxylic acid
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract From reversible emf measurements of the cell Pt/H2/KHPh+KCl/AgCl/Ag/Pt, reference value pH-metric standards, pH RVS , for 0.05 mol-kg−1 potassium hydrogenphthalate (KHPh) reference buffer solutions in 20, 50, and 80 wt % methylcellosolve (2-methoxyethanol, CH3O-CH2CH2OH)-water solvent mixtures from −10 to +45°C, have been determined in compliance with the criteria endorsed by IUPAC. The corresponding values of the first ionization constant ofo-phthalic acid (H2Ph, benzene-1,2-dicarboxylic acid), which is a key quantity for the acquisition of pH RVS standards, have been determined from emf measurements of the reversible cell Pt/H2/H2Ph+KHPh+KCl/AgCl/Ag/Pt.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00972832
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