Activity coefficients of single ions (V) in acetone and acetone‐water mixtures

Abstract

A method for the estimation of standard chemical potential differences (Ap') of single ions for the transfer from one solvent to another, described previously, is further improved and applied to the transfer from water to acetone and acetone-water mixtures.With some reservation a value of the surface potential x of acetone is derived.

Changes in H-Bonding of Cellulose During Solvent Purification Treatment (Acetonation)

“…It follows from these results shown in Figure 1 that acetone can be considered as a swelling agent for cellulose. This interpretation is based on the fact that, earlier, Bax et aL (1972) emphasized that the proton-solvating property of acetonewater mixtures systematically increases with the rise in concentration of acetone reaching a maximum in pure acetone. They attributed the protophylicity of acetone to the charge density distribution in the acetone molecule, in conjuction with its spatial structure, which strongly favours solvation of positive ions over that of negative ones.…”

“…At the same time, acetone is classified as a dipolar aprofic hydrophylic rather than hydrophobic solvent (i.e. HBA) (Frey-Wyssling 1953;Bax et al 1972;Isaacs 1974). This means, the high ratio of acetone (around 90%) in the solvent composition (i.e., usually acetone + protic solvent) brings about the following consequences;…”

“…However, the acetone effect (i.e., intramicellar swelling) is more pronounced than that of water. Hence, other important properties such as molecular structure and reactivity of a solvent, affecting penetrability and swellability, should be taken into account (Tchoubar 1966;Bax et al 1972;Isaacs 1974). In addition, it was also emphasized (Bradley and Krech 1993) that, with the increase of temperature, the molecules are more free and faster to re-orient and interact.…”

The Complex Solubilities of Silver Halides in Acetone-Water Mixtures

“…Kal [15] TPA + 4-X-= TPAX Ka2 [16] TPA + 4-AgX2-= TPAAgX2 Ka3 [17] TPA + 4-AgX3 -2 = TPAAgX3-Ka4 [18] The possible formation of the triple-ion TPA2AgX3 was not considered. Because specific data on the Ka's in Eq.…”

Anion Complexation by Calix[3]thieno[1]pyrrole: The Medium Effect

“…Blank experiments were carried out to ensure the absence of any nonvolatile material in the pure solvent. The possibility of solvate formation of 1 in the various solvents was checked by exposing the solid to a saturated atmosphere of the appropriate solvent for several days 13. (d) 1 H NMR Measurements 1.…”