Volumes and heat capacities of aqueous solutions of hydrochloric acid at temperatures from 298.15 K to 623 K and pressures to 28 MPa

Apparent molar volumes and heat capacities of aqueous acetic acid and sodium acetate at temperatures fromT= 278.15 K toT= 393.15 K at the pressure 0.35MPa

“…Three-dimensional surface of apparent molar heat capacities C p,φ for NaOH(aq) at p = 0.3 5 MPa by using equations (12) to (14) C o p,2 for NaOH(aq) and HCl(aq) with C o p,2 for NaCl(aq) from Archer (4) and C o p for water from Hill, (1) gives r C o p,m for ionization of water at temperatures from T = 278.15 K to T = 393.15 K at the pressure 0.3 5 MPa. These results are shown in figure 10, where it can be seen that our values agree within ±10 J·K −1 ·mol −1 of those reported by Simonson et al, (8) Sharygin et al, (9) and Allred et al (10) at, or near 0.1 MPa.…”

“…Similarly, V φ , ρ s , and V o for HCl(aq) were obtained by using equations given by Sharygin et al (9) Figures 8 and 9 show the (C p,φ , m, T ) surfaces obtained from our calorimetric measurements on HCl(aq) and NaOH(aq), respectively, and averages of our measured values are given in table 5. Our C p,φ results are in good agreement with those reported by Allred et al, (10) Tremaine et al, (11) and Simonson et al (8) Equations (12) to (14) were also used to describe the (C p,φ , m, T ) surfaces for HCl(aq) and NaOH(aq).…”

Apparent molar volumes and apparent molar heat capacities of aqueous potassium hydrogen phthalate (KHP) and potassium sodium phthalate (KNaP) at temperatures fromT= 278.15 K toT= 393.15 K at the pressure 0.35 MPa

“…Figure 3 also shows results given by Kitamura and Itoh (10) and Kauzmann et al (11) based on measurements of r V m obtained with dilatometers. Their values differ from our surface by 3.5 cm 3 · mol −1 and 6.9 cm 3 · mol −1 , respectively. Values of C p,φ for KHP(aq) and KNaP(aq) are given in tables 4 and 5, respectively.…”

“…(3) The resulting surface shows a small dependence on m at low m and almost linear dependence on T . We estimate an uncertainty of 2.6 cm 3 · mol −1 in our ( r V m , T, m) surface. Figure 3 also shows results given by Kitamura and Itoh (10) and Kauzmann et al (11) based on measurements of r V m obtained with dilatometers.…”

“…We also used a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetric Sciences Corp., Spanish Fork, UT, U.S.A.) to measure the heat capacities of the solutions. (1,2) We used our V φ and C p,φ results together with results for V φ and C p,φ for HCl(aq) (3,4) and NaCl(aq) (5) to calculate the changes in volume r V m and heat capacity r C p,m for proton dissociation of the hydrogen phthalate ion by process (1a) which is equivalent to reaction (1b).…”