caa a22 4500 477139272 CHVBK 20180405111728.0 cr unu---uuuuu 170330e19970301xx s 000 0 eng 10.1007/BF02768001 doi (NATIONALLICENCE)springer-10.1007/BF02768001 Buffers for the physiological pH range: Thermodynamic constants of substituted aminopropanesulfonic acids from 5 to 55°C [Elektronische Daten] [Rabindra Roy, Julie Carlsten, Jodi Niederschmidt, William Good, J. Rook, Christina Brewe, Amanda Kilker, Lakshmi Roy, Kathleen Kuhler] ThepK 2 values for 3-[(l,l-Dimethyl-2-hydroxymethyl)amino]-2-hydroxypropanesulfonic acid (AMPSO), and 3-[N,N-Bis(-hydroxyethyl)amino]-2-hydroxypropanesulfonic acid (DIPSO) have been determined at 12 temperatures over the range 5 to 55‡C by measurements of the emf of cells without liquid junction containing hydrogen and silver-silver chloride electrodes. The values of pK 2 for AMPSO and DIPSO were found to be 9.138 and 7.576, respectively, at 25‡C. The thermodynamic quantities, δG‡, δH‡, δS‡, and δC p ‡ were calculated from the change of the equilibrium constants with temperature. These buffer substances are useful as secondary pH standards in the physiological region of pH 7 to 9. Plenum Publishing Corporation, 1997 AMPSO nationallicence DIPSO nationallicence second dissociation constants nationallicence emf measurements nationallicence buffer solutions nationallicence activity coefficients nationallicence ionic strength nationallicence Roy Rabindra Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Carlsten Julie Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Niederschmidt Jodi Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Good William Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Rook J. Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Brewe Christina Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Kilker Amanda Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Roy Lakshmi Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Kuhler Kathleen Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Journal of Solution Chemistry Springer US 26/3(1997-03-01), 309-317 0095-9782 26:3<309 1997 26 10953 https://doi.org/10.1007/BF02768001 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02768001 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roy Rabindra Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Carlsten Julie Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Niederschmidt Jodi Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Good William Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Rook J. Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Brewe Christina Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Kilker Amanda Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Roy Lakshmi Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Kuhler Kathleen Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US 26/3(1997-03-01), 309-317 0095-9782 26:3<309 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer