Apparent Molar Volumes and Heat Capacities of Aqueous Trifluoromethanesulfonic Acid and Its Sodium Salt from 283 to 328 K |
| |
Authors: | Caibin Xiao Tram Pham Wei Xie Peter R. Tremaine |
| |
Affiliation: | (1) Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland, Canada, A1C3X7 |
| |
Abstract: | Apparent molar heat capacities Ctextp,fC_{{text{p}},phi } and volumes VfV_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 VfV_phi and Ctextp,fC_{{text{p}},phi } display a maximum near 0.8 mol-kg-1. VfV_phi also displays a shallow minimum at ~5 mol-kg-1, while Ctextp,fC_{{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+1On+ CF3SO3- (aq.), n = 5. Standard partial molar properties Cpo and Vo are consistent with results obtained from NaCF3SO3 (aq.) and yield values for the triflate anion CF3SO3- (aq.), over this range. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|