Dissociation constant of aqueous trifluoroacetic acid by cryoscopy and conductivity
- Cite this article as:
- Milne, J.B. & Parker, T.J. J Solution Chem (1981) 10: 479. doi:10.1007/BF00652082
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The dissociation constant of trifluoroacetic acid in aqueous solution has been determined at 25°C by electrical conductivity (0.65 mol-l−1) and at 0°C by cryoscopy (1.05 mol-l−1) and electrical conductivity (0.98 mol-l−1). The good agreement between the values of the constant determined by cryoscopy and conductivity at 0°C lends confidence to the value at 25°C determined by electrical conductivity. The constant determined at 25°C is in reasonable agreement with values determined by differential refractometry (0.92 mol-l−1) and from acidity function data (0.80 mol-l−1) reported by other workers. This work renews confidence in the electrical conductivity method for determining dissociation constants of moderately strong acids.