Aljana Petek (Author), Darja Pečar (Author), Valter Doleček (Author)

Abstract

Gostote mešanic etanola z vodo smo izmerili z gostometrom, ki je bil prirejen za visokotlačne poskuse. Meritve so potekale pri 298,15 K v območju tlakov od 0,1 MPa do 5 MPa. Iz izmerjenih gostot smo izračunali parcialne molske prostornine, presežene molske prostornine in koeficiente izometrične stisljivosti. Molske prostornine etanola in njegove parcialne molske prostornine v mešanicah z vodo se monotono zmanjšujejo s povečanjem tlaka. Pri vseh tlakih so presežene molske prostornine negativne. Numerične P-V zveze v odvisnosti od tlaka so za vsako sestavo raztopine podane s Hayworthovo enačbo.

Keywords

chemistry;high-pressure vibrating tube densimeter;excess molar values;isothermal compressibility;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: Slovensko kemijsko društvo
UDC: 54
COBISS: 6504214 Link will open in a new window
ISSN: 1318-0207
Views: 911
Downloads: 61
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Other data

Secondary language: Slovenian
Secondary abstract: Densities of ethanol-water mixtures have been measured using a vibrating tube densimeter and a different arrangement high-pressure experimental set-up. Measurements were carried out at 298,15 K in a pressure range from 0.1 MPa to 5MPa. Partial molar volumes, excess molar volumes and coefficients of isothermal compressibility were calculated. The molar volumes of alcohol and its partial molar volumes in mixtures with water are found to decrease monotonously with increasing pressure. Excess molar volumes are negative at all pressures. The numerical P-V relations at each composition are correlated satisfactorily as a function of pressure by the Hayward equation.
Secondary keywords: kemija;gostotometer;visokotlačni poskusi;presežne molske vrednosti;izotermična stisljivost;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 317-324
Volume: ǂVol. ǂ48
Issue: 3
Chronology: 2001
ID: 1748274