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Standards for pH measurements and first ionization constants of o-phthalic acid. Methylcellosolve-water solvent mixtures from -10 to 45°C

Journal of Solution Chemistry, ISSN: 0095-9782, Vol: 24, Issue: 12, Page: 1265-1279
1995
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From reversible emf measurements of the cell Pt/H/KHPh+KCl/AgCl/Ag/Pt, reference value pH-metric standards, pH, for 0.05 mol-kg potassium hydrogenphthalate (KHPh) reference buffer solutions in 20, 50, and 80 wt % methylcellosolve (2-methoxyethanol, CHO-CHCHOH)-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 of o-phthalic acid (HPh, benzene-1,2-dicarboxylic acid), which is a key quantity for the acquisition of pH standards, have been determined from emf measurements of the reversible cell Pt/H/HPh+KHPh+KCl/AgCl/Ag/Pt. © 1995 Plenum Publishing Corporation.

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