Apparent molar volumes and apparent molar heat capacities of Pr(NO3)3(aq), Gd(NO3)3(aq), Ho(NO3)3(aq), and Y(NO3)3(aq) at T = (288.15, 298.15, 313.15 and 328.15) K and p = 0.1 MPa
Relative densities and relative massic heat capacities have been measured for acidified solutions (prepared at University of Lethbridge) of Y(NO{sub 3}){sub 3}(aq), Pr(NO{sub 3}){sub 3}(aq), and Gd(NO{sub 3}){sub 3}(aq) at T = (288.15, 298.15, 313.15, and 328.15) K and p = 0.1 MPa. In addition, relative densities and massic heat capacities have been measured at the same temperatures and pressure for Y(NO{sub 3}){sub 3}(aq) and Ho(NO{sub 3}){sub 3}(aq) solutions which were supplied from the Lawrence Livermore National Laboratory (LLNL) (n.b. measurements at T = 328.15 K for Ho(NO{sub 3}){sub 3}(aq) were not performed due to the limited volume of solution available). Apparent molar volumes and apparent molar heat capacities for the aqueous salt solutions have been calculated from the experimental apparent molar properties of the acidified salt solutions using Young's Rule whereas the apparent molar properties of the LLNL solutions were calculated directly from the measured densities and massic heat capacities. The two sets of data for the Y(NO{sub 3}){sub 3}(aq) systems provide a check of the internal consistency of the Young's Rule approach we have utilized. The concentration dependences of the apparent molar volumes and heat capacities of the aqueous salt solutions have been modeled at each investigated temperature using the Pitzer ion interaction equations to yield apparent molar properties at infinite dilution. Complex formation within the aqueous rare earth nitrate systems is discussed and is qualitatively explored by probing the concentration dependence of apparent molar volumes and heat capacities. It is also shown that in spite of the complex formation within the aqueous rare earth nitrate systems there remains a high degree of self-consistency between the apparent molar volumes and heat capacities at infinite dilution reported in this manuscript and those previously reported for aqueous rare earth perchlorate salt systems.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15014711
- Report Number(s):
- UCRL-JRNL-205768; JCTDAF; TRN: US200807%%764
- Journal Information:
- Journal of Chemical Thermodynamics, Vol. 37, Issue 2; ISSN 0021-9614
- Country of Publication:
- United States
- Language:
- English
Similar Records
Apparent molar volumes of La(CF{sub 3}SO{sub 3}){sub 3}(aq) and Gd(CF{sub 3}SO{sub 3}){sub 3}(aq) at 278 K, 298 K, and 318 K at pressures to 30.0 MPa
Thermodynamics of aqueous aluminum: standard partial molar heat capacities of Al/sup 3 +/ from 10 to 55/sup 0/C