Determination of primary standards for pH measurements in glycerol + water solvent mixtures has been carried out based on reversible emf measurements of the cell Pt|H2|KHPh (mPS) + KCl (mCl)|AgCl|Ag|Pt where KHPh denotes the potassium hydrogen phthalate buffer solution of molality mPS = 0.05 mol-kg-1, at glycerol mass fractions wG = 0.2 and 0.4, within the temperature range -10 to 40°C. A multilinear regression procedure as a function of electrolyte molality, glycerol mass fraction wG, and temperature T has been applied for the data processing leading to the values of primary standards pHPS. These can be represented by the following regression equation pHPS = (4.007037±0.001113) + (3.55844±0.01776)XG +(0.39622±0.01410)Z + (4.3084±0.3377)Z2 - (50.66±10.53)XG Z2 + (457.10±78.48)XG2 Z2 where Z = (T - 298.15)/298.15. Parallel values of the first ionization constant of o-phthalic acid (H2Ph; benzene- 1,2-dicarboxylic acid, the parent acid of KHPh), which are essential for the above calculations, have been determined from reversible emf measurements of the cell Pt|H2|H2Ph (m1) + KHPh (m2) + KCl (m3)|AgCl|Ag|Pt over the range of solvent composition and temperatures mentioned above.

Ionization constant of o-phthalic acid and standard pH values of potassium hydrogen phthalate buffer solutions in (glycerol+water) solvent mixtures at normal and subzero temperatures / L. Falciola, P. Mussini, T. Mussini. - In: JOURNAL OF SOLUTION CHEMISTRY. - ISSN 0095-9782. - 29:12(2000), pp. 1199-1210.

Ionization constant of o-phthalic acid and standard pH values of potassium hydrogen phthalate buffer solutions in (glycerol+water) solvent mixtures at normal and subzero temperatures

L. Falciola
Primo
;
P. Mussini
Secondo
;
T. Mussini
Ultimo
2000

Abstract

Determination of primary standards for pH measurements in glycerol + water solvent mixtures has been carried out based on reversible emf measurements of the cell Pt|H2|KHPh (mPS) + KCl (mCl)|AgCl|Ag|Pt where KHPh denotes the potassium hydrogen phthalate buffer solution of molality mPS = 0.05 mol-kg-1, at glycerol mass fractions wG = 0.2 and 0.4, within the temperature range -10 to 40°C. A multilinear regression procedure as a function of electrolyte molality, glycerol mass fraction wG, and temperature T has been applied for the data processing leading to the values of primary standards pHPS. These can be represented by the following regression equation pHPS = (4.007037±0.001113) + (3.55844±0.01776)XG +(0.39622±0.01410)Z + (4.3084±0.3377)Z2 - (50.66±10.53)XG Z2 + (457.10±78.48)XG2 Z2 where Z = (T - 298.15)/298.15. Parallel values of the first ionization constant of o-phthalic acid (H2Ph; benzene- 1,2-dicarboxylic acid, the parent acid of KHPh), which are essential for the above calculations, have been determined from reversible emf measurements of the cell Pt|H2|H2Ph (m1) + KHPh (m2) + KCl (m3)|AgCl|Ag|Pt over the range of solvent composition and temperatures mentioned above.
Settore CHIM/01 - Chimica Analitica
Settore CHIM/02 - Chimica Fisica
2000
http://scienceserver.cilea.it/pdflinks/10092014314403752.pdf
Article (author)
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/146776
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? ND
social impact