Excess Molar Volumes and Apparent Molar Volumes of Some Amide + Water Systems at 303.15 and 308.15 K

Abstract

Excess molar volumes Vf, for the binary mixtures of A-methylformamide, AvV-dimethylformamide, 2-pyrrolidinone, A-methyl-2-pyrrolidinone, and A/^-dimethylacetamide with water have been measured using a continuous-dilution dilatometer at 303.15 and 308.15 K as a function of composition. In all mixtures, the excess molar volumes are negative over the entire composition range. The results were used to estimate the apparent molar volumes of the components. The values of these two properties have been discussed in terms of intermolecular interactions between the mixing components of the binary mixture.

Volumetric properties of binary mixtures of N, N- dimethylformamide with water or water- d2 at temperatures from 277.13 K to 318.15 K

“…At T = 298.15 K, which seems to be the most frequently used temperature in the density measurements, there is an excellent agreement between our V E m values and the values reported by Bai et al, (57) de Visser et al, (56) Davis, (54) Chu et al, (40) and Benedetti et al (39) {figure 2(c)}. The dilatometric V E m values reported by Rajasekhar et al (60) at T = 303.15 K {figure 3(a)} and Singh et al (62) at T = 308.15 K {figure 3(b)} differ quite dramatically from the dilatometric values of Pal et al (61) and from the values obtained in this work by the density measurements at the corresponding temperatures. The dilatometric values measured by Zielkiewicz (63,64) at T = 313.…”

“…Besides the numerous V E m values based on the density measurements of (H 2 O + DMF) {figure 2(a)-2(f)}, there exist also a number of dilatometric values (60)(61)(62)(63)(64) for V E m in the literature. In figure 3(a)-3(c) a comparison is made between the dilatometric literautre values and the values determined in the present work by the density measurements of (H 2 O + DMF).…”

“…Therefore, plotting V E m /{x 1 (1 − x 1 )} against x 1 and extrapolating to x 1 = 0 and x 1 = 1 will give the limiting excess partial molar volumes V (27) 15.22 (27) 278.15 72.20 (40) 14.91 (40) 71.53 (72) 14.96 (72) 283.15 72.68 (40) 15.28 (40) 72.09 (59) 15.18 (59) (27) 15.54 15.45 (40) 74.62 (39) 15.46 (39) 73.61 (39) 15.08 (40) 298.15 74.49 74.24 (12) 15.23 15.32 (12) 74.54 (27) 16.00 (27) 74.93 (39) 15.40 (39) 74.07 (40) 15.64 (40) 74.55 (54) (39) 15.51 15.53 (39) 74.46 (40) 15.51 (40) 74.45 (58) 15.32 (58) 73.75 (60) 13.50 (60) 73.97 (61) 15.46 (61) 308.15 75.27 75.17 (27) 15.70 16.65 (27) 74.89 (40) 15.15 (40) 74.24 (61) 15.69 (61) 74.88 (61) 14.32 (61) 313.15 75.70 75.87 (39) 15.69 15.77 (39) 76.47 …”

Theories of Ultrasonic Velocities and their Application in Binary Liquid Mixtures of N-Ethylaniline with Some Toluenes (Toluene, o-Nitrotoluene and m-Nitrotoluene)

“…Ethlyaniline (Merck India >0.995 purity) was distilled at low pressure and over freshly activated 0.3 nm molecular sieves 24 . Other compounds under study as mentioned above (SD Fine Chemicals, India, with purity >0.995) were purified by methods described in the literature 25 .…”

Theoretical Evaluation of Ultrasonic Velocities in Binary Liquid Mixtures of Anisaldehyde with Some Alcoxyethanols at Different Temperatures

“…Anisaldehyde (Merck India >0.995 purity) was distilled at low pressure and over freshly activated 0.3 nm molecular sieves [25]. The alcoxyethanols under study mentioned above 2 ISRN Physical Chemistry (SD Fine Chemicals, India, with purity >0.995) were purified by methods described in the literature [26].…”