Abstract
Apparent molar heat capacities \(C_{{\text{p}},\phi }\) and volumes \(V_\phi\) of aqueous trifluoromethanesulfonic (triflic) acid, HCF3SO3 (aq.) were determined with a Picker flow microcalorimeter and vibrating-tube densimeter at temperatures from 283 to 328 K and molalities from 0.05 to 9.5 mol-kg-1. Values of \(V_\phi\) and \(C_{{\text{p}},\phi }\) display a maximum near 0.8 mol-kg-1. \(V_\phi\) also displays a shallow minimum at ∼5 mol-kg-1, while \(C_{{\text{p}},\phi }\) continues to decrease smoothly up to the limit of our measurements at 9.5 mol-kg-1. We attribute this behavior to ion–ion interaction between triflate and the hydrated proton to form the aqueous complex H2n+1O +n CF3SO -3 (aq.), n = 5. Standard partial molar properties C op and Vo are consistent with results obtained from NaCF3SO3 (aq.) and yield values for the triflate anion CF3SO -3 (aq.), over this range.
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Xiao, C., Pham, T., Xie, W. et al. Apparent Molar Volumes and Heat Capacities of Aqueous Trifluoromethanesulfonic Acid and Its Sodium Salt from 283 to 328 K. Journal of Solution Chemistry 30, 201–211 (2001). https://doi.org/10.1023/A:1005230514566
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DOI: https://doi.org/10.1023/A:1005230514566