Thermodynamic Study of Glycine in Different Tetrahydrofuran—Water Mixtures at Several Temperatures from 278.15 to 328.15 K

Second-stage dissociation constants of piperazine-N,N'-bis(2-ethanesulfonic acid) monosodium monohydrate and related thermodynamic functions in water from 5 to 55.degree.C

“…Conventional paH values for buffer solutions prepared from PIPES and sodium hydroxide have been reported (11) and these solutions are considered as secondary standards for the control of pH range of physiological interest. The response of the single-crystal lanthanum fluoride electrode was evaluated in both direct potentlometry and potentlometrlc titrations In a variety of alcohols and dipolar aprotic solvents and In their mixtures with water.…”

“…where E°is the standard electrode potential of the Ag-AgBr electrode in H20 (76). Since the paH of the cell solutions (for example, 0.1 m PIPES + 0.1 m NaPIPESate) at 25 °C is 6.487 (11), any hydrolysis corrections for P* and P™ in this neutral region are unnecessary.…”

“…Conventional poH values for equimolal buffers (0.02, 0.03,0.05, and 0.1 mol kg™1) of PIPES and NaPIPESate from 5 to 55 °C including 37 °C have recently been reported (11). In this work, we present the values of pK2 and associated thermodynamic quantities (AG°, H°, AS°, and ACp°) at 12 temperatures from 5 to 55 °C, including 37 °C by measuring the emf of cells without liquid junction of the type Pt;H2(g,l atmjlP^m!…”