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Thermodynamics of Selected Aqueous Rare-Earth Elements Containing Triflate Salts at T=(288.15, 298.15, 313.15 and 328.15) K and p=0.1 MPa

  • Special Issue Dedicated to Joseph Antoine Rard
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Abstract

Aqueous acidified solutions of the rare-earth-element (REE) triflates (Gd(CF3SO3)3(aq), Dy(CF3SO3)3(aq), Nd(CF3SO3)3(aq), Er(CF3SO3)3(aq), Yb(CF3SO3)3(aq) and Y(CF3SO3)3(aq)) have been prepared by the dissolution of the corresponding REE oxides in dilute aqueous trifluoromethanesulfonic acid (triflic acid, CF3SO3H(aq)). Relative densities and relative massic heat capacities have been measured for these systems over the approximate ionic strength range 0.10≤I/(mol⋅kg−1)≤1.35 at T=(288.15, 298.15, 313.15 and 328.15) K and p=0.1 MPa. These measurements were completed using a Sodev O2D vibrating tube densimeter and Picker-flow microcalorimeter, respectively. Relative densities and relative massic heat capacities for aqueous solutions of triflic acid and its sodium salt have also been measured over the concentration range 0.018≤m 2/(mol⋅kg−1)≤0.23 over the same temperature range at p=0.1 MPa.

Young’s rule has been used to calculate apparent molar volumes and apparent molar heat capacities of the aqueous solutions of REE triflate salts from the calculated apparent molar properties of the acidified salt solutions. These properties have been modeled using the Pitzer ion-interaction equations. The apparent molar properties of aqueous triflic acid solutions and aqueous solutions of its sodium salt have also been modeled using the same Pitzer ion-interaction equations.

The apparent molar properties at infinite dilution obtained from our property modeling have been used to calculate single ion volumes and single ion heat capacities for each of the aqueous ions; Gd 3+(aq) , Dy 3+(aq) , Nd 3+(aq) , Er 3+(aq) , Yb 3+(aq) , and Y 3+(aq) . The reported single ion values have been compared with those previously reported in the literature.

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Authors and Affiliations

  1. Department of Chemistry & Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, T1K 3M4, Canada

    Kristy M. Erickson, Andrew W. Hakin, Stephanie N. Jones, Jin L. Liu & Sharmeen N. Zahir

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  1. Kristy M. Erickson
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  2. Andrew W. Hakin
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  4. Jin L. Liu
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Correspondence to Kristy M. Erickson or Andrew W. Hakin.

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Erickson, K.M., Hakin, A.W., Jones, S.N. et al. Thermodynamics of Selected Aqueous Rare-Earth Elements Containing Triflate Salts at T=(288.15, 298.15, 313.15 and 328.15) K and p=0.1 MPa. J Solution Chem 36, 1679–1726 (2007). https://doi.org/10.1007/s10953-007-9209-3

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