caa a22 4500 477139175 CHVBK 20180405111727.0 cr unu---uuuuu 170330e19971201xx s 000 0 eng 10.1023/A:1022937324983 doi (NATIONALLICENCE)springer-10.1023/A:1022937324983 Second Dissociation Constant of Two Substituted Aminomethanesulfonic Acids in Water from 5 to 55°C [Elektronische Daten] [Rabindra Roy, Catherine Moore, Julie Carlsten, William Good, Patricia Harris, Jerry Rook, Lakshmi Roy, Kathleen Kuhler] The equilibrium constants for the dissociation steps of (4-morpholineethanesulfonic acid) (MES) and (2-{[tris(hydroxymethyl)methyl]-1-ethanesulfonic acid (TES) have been determined at 12 and 7 different temperatures, respectively, from 5 to 55°C. The emf measurements were carried out by using a cell without liquid junction of the type: Pt; H2 (g, 1 atm) | buffer(m1), Na salt of buffer(m2), NaCl(m3) | AgCl, Ag. The pK 2 values of MES and TES at 25°C are 6.269 and 7.550. The thermodynamic quantities for the dissociation process have been calculated. These zwitterionic compounds are useful for pH control as standard buffers in the physiological region of pH 5.50 to 6.50 for MES, 6.5 to 7.5 for TES, respectively. Reliable measurements of the pH at isotonic saline solution (I = 0.16m) such as blood and plasma are important for clinical diagnosis. Plenum Publishing Corporation, 1997 MES nationallicence TES nationallicence emf nationallicence standard potential nationallicence zwitterion nationallicence buffer solution nationallicence activity coefficients nationallicence dissociation constants nationallicence Roy Rabindra Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Moore Catherine Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Carlsten Julie Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Good William Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Harris Patricia Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut Rook Jerry 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 Kluwer Academic Publishers-Plenum Publishers 26/12(1997-12-01), 1209-1216 0095-9782 26:12<1209 1997 26 10953 https://doi.org/10.1023/A:1022937324983 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1022937324983 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Roy Rabindra Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Moore Catherine 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- Good William Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Harris Patricia Hoffman Department of Chemistry, Drury College, 65802, Springfield, Missouri aut NATIONALLICENCE 700 1- Rook Jerry 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 Kluwer Academic Publishers-Plenum Publishers 26/12(1997-12-01), 1209-1216 0095-9782 26:12<1209 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer