𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Calorimetric investigation of excess molar heat capacities for water  +  ethylene glycol from T =  273.15 to T =  373.15 K

✍ Scribed by Zhaodong Nan; Beiping Liu; Zhicheng Tan

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
204 KB
Volume
34
Category
Article
ISSN
0021-9614

No coin nor oath required. For personal study only.

✦ Synopsis

The molar excess heat capacity C E p,m of (1 -x)H 2 O + xHOCH 2 CH 2 OH has been measured in the temperature range from 273.15 K to 373.15 K at 5 K intervals. The C E p,m values are negative and positive at all compositions between temperatures of (273.15, 283.15, 333.15 and 373.15) K, respectively. Between T = 288.15 K and T = 328.15 K, C E p,m values are positive for the mixtures rich in water and negative for the mixtures rich in ethylene glycol with maxima at values of x about 0.07, 0.3 and with minima at values of x about 0.6. The curve of C E p,m against x at T = 303.15 K is unusual in showing three maximum values at values of x at about 0.07, 0.3, and 0.4, respectively. The curves of C E p,m against T show that the effects of T on C E p,m at x = 0.03124, 0.5372, and 0.7232 are more complex. The shapes of the curves of C E p,m against x and their changes with temperature can be accounted for by the structure of the binary system.

πŸ“œ SIMILAR VOLUMES

Activity coefficients of electrolyte and
Activity coefficients of electrolyte and amino acid in the systems (water  +  potassium chloride  + dl -valine) at T = 298.15 K and (water  +  sodium chloride  + l -valine) at T =  308.15 K
✍ A. Khavaninzadeh; H. Modarress; V. Taghikhani; M.K. Khoshkbarchi πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 English βš– 139 KB

The activity coefficient data were reported for (water + potassium chloride + DL-valine) at T = 298.15 K and (water + sodium chloride + L-valine) at T = 308.15 K. The measurements were performed in an electrochemical cell using ion-selective electrodes. The maximum concentrations of the electrolytes

Excess molar volumes and excess molar he
Excess molar volumes and excess molar heat capacities of (polyethylene glycols + water) at temperatures betweenT = 278 K andT = 328 K
✍ C. Aucouturier; G. Roux-Desgranges; A.H. Roux πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 163 KB

Densities of aqueous solutions of the following polyethylene glycols (PEGs) of average molar mass (300, 400, and 600) gβ€’mol -1 have been measured over the entire mass fraction range at T = 298.15 K, using a vibrating-tube densimeter. In the case of PEG 300, heat capacities have been determined at T

Excess molar enthalpies and excess molar
Excess molar enthalpies and excess molar volumes of binary systems containing {xCH3(CH2)7Cl +  (1  βˆ’ x)CH3(CH2)n βˆ’ 1OH} (n =  4 to 8) atT =  298.15 K
✍ P. Santana; J. Balseiro; J. Salgado; E. JimΓ©nez; J.L. Legido; L. Romanı́; M.I. P πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 139 KB

TABLE 1. Densities ρ for the pure liquids at T = 298.15 K Liquid ρ/(g β€’ cm -3 ) expt lit 1-Cholorooctane 0.86875 0.86876 (4) 1-Butanol 0.80575 0.80576

Measurement and correlation of activity
Measurement and correlation of activity coefficients for the ternary system (sodium bromide  +  sodium acetate  +  water) at T =  298.15 K
✍ Weidong Yan; Rui Zhang; Ranran Fu; Shijun Han πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 English βš– 89 KB

Activity coefficients of sodium bromide in aqueous mixtures of sodium bromide and sodium acetate were determined by e.m.f. measurements at T = 298.15 K and the total ionic strengths of (0.1, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) mol β€’ kg -1 . The experimental results were fitted using the Scatchard-Rush

Heat capacity of potassium tungstates K2
Heat capacity of potassium tungstates K2WnO3n + 1(n =  2, 3, 4) at temperatures from 273 K to 979 K
✍ Q. Chen; S. Liu; P. Zhang πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 92 KB

Compounds K 2 W n O 3n+1 (n = 2, 3, 4) were synthesized using a pyrometallurgical technique. The products were characterized by X-ray diffraction analysis and found to be single-phase compounds. The enthalpy increments T 273.15 K H o m of each compound were measured by a drop method using a high-tem

Excess molar volumes, and changes of ise
Excess molar volumes, and changes of isentropic compressibilities of ternary { acetone +  methanol  + ( 2-methyl-1-propanol, or 3-methyl-1-butanol)} at T =  298.15 K
✍ Lidia M. CasΓ‘s; Gonzalo Marino; Miguel Iglesias; Beatriz Orge; JosΓ© Tojo; Laura πŸ“‚ Article πŸ“… 2001 πŸ› Elsevier Science 🌐 English βš– 133 KB

The speed of sound, and density of the ternary {acetone + methanol + (2-methyl-1propanol, or 3-methyl-1-butanol)} were measured at T = 298.15 K, and atmospheric pressure. The experimental measurements allowed the calculation of the corresponding derived properties, as well as the analysis of the dep