Ionization constants ofo-phthalic acid in (propylene carbonate + water) and (ethylene carbonate + water), and thermodynamics of the cellPt|H2|HCl(m)| Hg2Cl2|Hg |
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| Institution: | 1. Molecular Engineering Institute, Kinki University, 11-6 Kayanomori, Iizuka, Fukuoka 820-8555, Japan;2. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259-G1-9 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;3. Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan;4. Department of Chemistry, Shiga University of Medical Science, Seta, Otsu, Shiga 520-2192, Japan;5. Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;1. Pre-treatment and Finishing of Cellulosic Fibres Dept., Textile Research Division, National Research Centre (Scopus Affiliation ID 60014618), Dokki, Giza, Egypt;2. Polymer Dept., National Research Centre, Dokki, Giza, Egypt;3. Department of Pharmacognosy, Pharmaceutical and Drug Industries Division, National Research Centre, Dokki, Giza, Egypt;1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China;2. Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, PR China;3. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, PR China;1. Department of Chemical Engineering, Yasooj Branch, Islamic Azad University, Yasooj, Iran;2. Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia;3. Department of Chemical Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran;1. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, People''s Republic of China;2. Key Laboratory of Oil & Gas Reservoir Stimulation, CNPC, Langfang, Hebei 065007, People''s Republic of China |
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| Abstract: | The potential differences E of the cells Pt|H2|H2Ph(m1) + KHPh(m2) + KCl(m3) in Z|AgCl|Ag and Pt|H2|H2Ph(m1) + KHPh(m2) + KCl(m3) in Z|Hg2Cl2|Hg have been measured at T = 298.15 K in mixtures Z = (W + S) of water (W) with cosolvents S = propylene carbonate (PC) and S = ethylene carbonate (EC), to determine the first ionization constants K of the o -phthalic acid H2Ph(benzene-1,2-dicarboxylic acid), which are indispensable for the determination of primary pH-metric standards based on the potassium hydrogen phthalate buffer (KHPh) in such solvent mixtures. The value of K is seen to decrease progressively with increasing mass fraction wsof the organic cosolvent, as with all of the other cosolvents studied earlier, but no simple relationship with the cosolvent permittivity is discernible. Since the required values of the standard potential difference Eoof the second cell were hitherto missing, they have now been obtained based on potential difference measurements of the cell Pt|H2|HCl(m) in Z|Hg2Cl2|Hg. The primary medium effect (EWo − EZo, by Owen’s definition) upon HCl in water-rich mixtures Z is seen to increase linearly with increasing ws, as in earlier investigations. In this comparative context, the slope of the primary medium effect against wsplots for the aprotic cosolvents increases regularly with decreasing permittivity, whereas for the protic (alcoholic) cosolvents the slope is ill-defined. |
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