Potentiometric Titration in Nopaqeous Solutions

Thermodynamic acid dissociation constant of the protonated form of tris(hydroxymethyl)aminomethane in water + 50 mass % 2-methoxyethanol solvent from 278.15 to 318.15 K

“…The relative partial molal enthalpy and entropy for the acidic dissociation of TrisH+ are calculated by AG°= 2.303R{A + BT + CT2) (10) since AS0 = -idG°/dT)p (11) AS°= -2.303R(B + 2 CT) (12) using AH0 = AG°+ TAS°( 13) and substituting eq 10 and 12 in eq 13 AH0 = 2.303R(A -CT2) (14) Values obtained from eq 10, 12, and 14 are listed in Table IV.…”

“…In 1938, Ruehle (10) recommended the use of 2-methoxyethanol (2-met) as an excellent solvent for potentiometric titrations. Later the apparent dissociation constants of a considerable number of weak acid systems were determined in the solvent mixture water + 80 mass % 2-methoxyethanol (11).…”

The Determination of Carboxylic Acids

“…), (7) halogenated hydrocarbons (chloroform, carbon tetrachloride, etc.) (10 ) For the titration of fairly weak acids, glycol-hydrocarbon mixtures (11 ) appear to be still better solvents. In these solvents the acidic (or basic) properties of solutes are not changed.…”

Potentiometric Titrations. A Review with Bibliography

“…Butyl Carbitol (Halford,220) Alcohols, as medium for amino acid titration (Ogston and Brown, 421; Neuberger, 412; Balsón et al, 33) Alcohols, acetone, benzene, hexalin, and mixtures as media, using antimony or tellurium electrodes (Tomícek and Feldmann, Alcohol-anisole (Demarest and Rieman, 101) Benzene as medium (LaMer and Downes, S20) Cellosolves (glycolmonalkyl ethers) as media (Ruehle,466) Propionic acid as medium for the titration of organic bases (acetanilide, acetamide, urea, acetoxime), (Terjesen and Sandved, 571)…”