ISSN:
1572-8927
Keywords:
Trifluoroacetic acid
;
dissociation constant
;
cryoscopy
;
electrical conductivity
;
ionization constant
;
acidity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00652082
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