Apparent molar heat capacities and volumes of aqueous solutions of several 1:1 electrolytes at elevated temperatures

Abstract

. Can. J. Chem. 64,926 (1986). The results of heat capacity (C,) and density (d) measurements at 0.6 MPa and in the temperature range 298.15-373.15 K are presented for several 1:l electrolytes in water. The flow microcalorimeter and densimeter used for these measurements were modificatons of the room-temperature designs. Data were obtained over concentrations ranging from 0.02 to 1 . O mol kg-' (or to the solubility limit, whichever was lower). The heat capacity of a solution relative to that of water was measured with a precision of kO.l mJ K-' g-' at all temperatures. The density of a solution relative to that of water was measured with a precision of ?5 pg ~m -~. These C, and dresults were used to calculate the apparent molar heat capacities, +c,, and volumes, +v, at 298.15, 323.15,348.15, and 373.15 K, at a constant pressure of 0.6 MPa. These results are in good agreement with available literature data.

Isobaric specific heat capacity of water and aqueous cesium chloride solutions for temperatures between 298K and 370K at p=0.1MPa

“…The form of this equation is justified by the linear dependence of the heat capacity of water and of the solutions with temperature and the well-known dependence on the square root of the molality from the Debye-Hü ckel limiting law. Figure 3 shows the deviation of the present data from the fit, and it also includes data presented by different authors [5][6][7][8][9]. With a few exceptions, the majority of the data lies within ±2% of the correlation.…”

“…With the exception of the point for a molality greater than 4.5 mol AE kg À1 , outside the range of the fit, all the measured points have deviations smaller than ±1.5%. The results of Fortier et al [6] and Saluja et al [8] were obtained with flow micro-calorimeters, the first with a claimed uncertainty of 0.3% and the second with a claimed uncertainty better than 0.1%. The temperature scale used must have been ITPS-68, but no reference is made.…”

Thermodynamic modeling of aqueous Ca 2+ – Na + – K + – Cl − quaternary system

“…Later on, Perron et al [24] reported liquid heat capacity data at 298.15 K with moderately high concentration ranges of~(0.05e6.5) mol/kg. Saluja and LeBlanc [25] published liquid heat capacity data at 298.15 and 323.15 K at low concentration of~(0e0.88) mol/kg. Additionally, Zaystev and Aseyev [26] published a large number of smoothed liquid heat capacity data for a wide range of temperatures and concentrations.…”

“…The heat capacity data reported by Saluja et al [27] at (298.15e373.15) K are also used in regression with relative weight of 100 and MRD of 0.42%. The low concentration heat capacity data reported by Saluja and LeBlanc [25] at 323.15 K are used for comparison with the model results. The MRD is found to be 0.47%.…”

Aqueous electrolyte solution modelling: Some limitations of the Pitzer equations

“…Lines from the JESS Pitzer model. (1974,1981), Saluja and LeBlanc (1987), Saluja et al (1995), Holmes et al (1997) and Call et al (2000). Lines from the JESS Pitzer model.…”