Calibration of a fixed-cell temperature-scanning calorimeter to measure precise solution heat capacities from 275 to 398 K at 0.35 MPa

Thermodynamics for ionization of water at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa: apparent molar volumes of aqueous KCl, KOH, and NaOH and apparent molar heat capacities of aqueous HCl, KCl, KOH, and NaOH

“…The use and calibration of the fixed-cell scanning calorimeter (NanoDSC model 6100, Calorimetry Sciences Corporation, Spanish Fork, UT, U.S.A.) has been described previously. (4,5) Scans for each experiment were made at temperatures 273. 15 T /K 398.15 and at the pressure 0.35 ± 0.01 MPa.…”

Apparent molar volumes and apparent molar heat capacities of aqueous solutions ofN,N- dimethylformamide andN,N- dimethylacetamide at temperatures from 278.15 to 393.15 K and at the pressure 0.35 MPa

“…A twin fixed-cell, powercompensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetric Sciences Corp., Spanish Fork, UT, U.S.A.) was used to measure the heat capacities of the solutions at 278.15 < T /K < 393.15 from which values of C p,φ were obtained. (4)(5)(6) All experiments were performed at the pressure 0.35 MPa.…”

Apparent molar volumes and apparent molar heat capacities of aqueous solutions of isomeric butanols at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa

“…Figures 1 to 5 show these (V φ , m, T ) results for each of the isomers, where the regressed surfaces are for the empirical function given in equation (5): The regression was performed with weighting factors equal to the reciprocal of the estimated uncertainties in V φ from tables 1 to 5. The regression parameters v i for equation (5) are given in table 6. The largest deviations from the regressions occur at the lowest m where the uncertainty in V φ is greatest, corresponding to the smallest differences between ρ s and ρ w .…”

“…(6) Densities of the solutions obtained with this system were reproducible to within ± 10 µg · cm −3 for all compounds at all T and m. The calorimeter was calibrated and used as described previously. (4)(5)(6) Measurements were recorded at a scan rate r of 16.6667 mK · s −1 for both heating and cooling at 273.15 < (T /K) < 398.15 and at the pressure p = 0.35 0 ± 0.01 5 MPa. Data were collected for at least 4 scans up and 4 scans down with each solution.…”

“…A twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetric Sciences Corp., Provo, UT, U.S.A.) was used to measure the heat capacities of the solutions at 278.15 < (T /K) < 393.15 from which values of C p,φ were obtained. (4)(5)(6) …”