Speeds of sound and isentropic compressibilities of (n-alkoxyethanols +  toluene) at T =  298.15 K

✍ Scribed by Amalendu Pal; Rakesh Kumar Bhardwaj

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 960 KB
• Volume: 34
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.2001.0908

✦ Synopsis

Speeds of sound u at the temperature 298.15 K for six (n-alkoxyethanol + toluene) were measured over the whole composition range. The n-alkoxyethanols were 2methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-(2-methoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, and 2-(2-butoxyethoxy)ethanol. Excess molar volumes V E m at T = 298.15 K were also measured for the mixtures of toluene and 2-methoxyethanol, 2-ethoxyethanol, or 2-butoxyethanol over the whole composition range. The speed of sound values were combined with excess molar volumes to obtain values for the product K S,m of the molar volume and the isentropic compressibility κ S , and the corresponding excess quantities K E S,m were also calculated. The K E S,m curves are sigmoid for all mixtures. The deviations of the speeds of sound u D from their values u id in an ideal mixture were obtained for all measured mole fractions. These values are compared with the mixing function δu calculated in the paper. The behaviour of u, u D , δu, and K E S,m as a function of composition and number of carbon atoms in the aliphatic chain of the alkoxyethanol is discussed. Also, theoretical values of the molar isentropic compressibility K S,m and speed of sound u were calculated using the Prigogine-Flory-Patterson theory with a van der Waals potential energy model and the results compared with experimental data.