摘要:

The electrical conductivities of LiBr, NaBr, KBr and CsBr in the mixtures ofN,N–dimethylformamide with water, within the whole composition range (up to 80 mol% DMF for CsBr) have been measured. The obtained results were analysed using the Fuoss–Justice equation. The dependencies of the limiting molar conductances (Δ0), Walden products (Δ0η) and association constants (KA) versus mixed solvent composition has been discussed.

ISSN:0031-9104    

DOI:10.1080/00319109708030563

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Experimentally measured values of dielectric constant () at a frequency of 455 kHz and temperature 303.16K in binary polar mixture of acetyl acetone and of di-iso-butyl ketone in chlorobenzene, bromobenzene and toluene have been used to compute the mutual correlation factor (gab), the excess molar polarization (ΔP) and the Gibb's free energy of mixing (ΔGab) using Winkelmann-Quitzsch equations. The results are utilised in interpreting the molecular association and hence the nature of clusters involving unlike molecules.

ISSN:0031-9104    

DOI:10.1080/00319109708030564

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Molar excess volumes, (VE) and the ultrasonic sound velocity (U) of binary mixtures of triethylamine with ethylbenzene, chlorobenzene, bromobenzene and nitrobenzene have been measured at 308.15 K. The speed of sound data were used to compute isentropic compressibilities (ΔKS) and deviation in isentropic compressibilities (ΔKS).VEvalues and ΔKSvalues are negative in all the systems, over the entire range of composition. The results are interpreted on the basis of intermolecular interactions between unlike molecules.

ISSN:0031-9104    

DOI:10.1080/00319109708030565

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The Gibbs energies of transfer and the solvent transport numbers of silver(I) salts viz. silver sulphate, silver bromate and silver iodate have been determined in ethanolpyridine mixtures over the complete range of compositions at 30°C. The solubility of all the salts passes through a maximum nearXpy=0.6,Xpy=0.5 andXpy=0.6 for silver sulphate, bromate and iodate respectively and decreases subsequently with further addition of pyridine. The standard Gibbs energies of transfer from ethanol to ethanolpyridine mixtures were calculated from the thermodynamic solubility products of the salts in these mixtures and found to decrease up toXpy=0.3,Xpy=0.3 andXpy=0.6 for silver sulphate, bromate and iodate respectively and then increase with the addition of pyridine. The ionic free energy of transfer of silver ion, determined on the basis of negligible liquid junction potential method, was found to be negative and decreases continuously while that of anions is positive and increases with the addition of pyridine. A large positive value of the solvent transport number, Δ is observed for all the salts in these mixtures. These results indicate that all the silver salts are heteroselectively solvated ie the silver ion is preferentially solvated by pyridine and anions by ethanol in this mixed solvent system.

ISSN:0031-9104    

DOI:10.1080/00319109708030566

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

By means of a toroidal oscillating viscometer logarithmic decrements of dampings have been measured in the presence or absence of HgTl amalgam at 40.1 atomic percent of thallium at different temperatures, ranging from +0.125°C to +15.500°C, with fluctuations every 0.25°C. Measurements were performed in two different periods (1:29/01/1992-14/04/1992 and 2: 18/04/1992-24/09/1992). In both periods, the eutectic was found at 1.125°C. When comparing 40.1% at. Tl, 40% at. Tl and 39.9% at. Tl amalgams, values of the eutectic are perfectly coincident. The logarithmic decrement of the 40.1% at. Tl is located, in the phase diagram, on the left side with respect to the 40% at. Tl.

ISSN:0031-9104    

DOI:10.1080/00319109708030567

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Isentropic compressibilities of ten ternary mixtures butylacetate(1)+propanol(2)+benzene(3),+toluene(3),+chlorobenzene(3),+bromobenzene(3) and+nitrobenzene and butylacetate(1) +butanol(2)+benzene(3),+toluene(3), chlorobenzene(3),+bromobenzene(3) and+nitrobenzene(3) respectively were determined from speed of sound measurements at 303.15 K.

ISSN:0031-9104    

DOI:10.1080/00319109708030568

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A statistical thermodynamic model is used to establish a link between the chemical order, topological order and the concentration fluctuations in the nearest neighbour shell of a binary mixture. The topological order related to density fluctuations is found to play the dominant role in the process of phase separation.

ISSN:0031-9104    

DOI:10.1080/00319109708030569

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109708030562

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor