The trifluoroacetic acid solvent system. Part V. Cryoscopic measurements

1976 ◽  
Vol 54 (19) ◽  
pp. 3031-3037 ◽  
Author(s):  
Michael G. Harriss ◽  
John B. Milne
Keyword(s):  
Trifluoroacetic Acid ◽  
Dissociation Constants ◽  
Freezing Point ◽  
Solvent System ◽  
Ion Pair ◽  
Conductivity Measurements ◽  
Cast Doubt ◽  
System Part ◽  
Triple Ions ◽  
Cryoscopic Constant

Measurement of freezing point depressions for the non-electrolytes, CCl4. CH3SO2F, and (CF3CO)2O permit calculation of the cryoscopic constant for trifluoroacetic acid, HOTFA. Water is shown to give freezing point depressions lower than those for non-electrolytes and this is attributed to association. Freezing point depressions for NaOTFA, KOTFA, and CsOTFA have been measured and accounted for in terms of ion-pair dissociation constants previously determined from electrical conductivity measurements. The results cast doubt on the existence of triple ions in this solvent.

Cryoscopy in molten pyridinium chloride

1967 ◽  
Vol 20 (12) ◽  
pp. 2583 ◽  
Author(s):  
H Bloom ◽  
VC Reinsborough
Keyword(s):  
Solid Solution ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Heat Of Fusion ◽  
Dilute Solution ◽  
Pyridinium Chloride ◽  
Cryoscopic Constant

The molal cryoscopic constant in molten pyridinium chloride (m.p. 146.0�) has been found to be 17.4� (subject to confirmation by calorimetry) and the cryoscopic heat of fusion, 2310�40 cal mole-1. In pyridinium chloride as a solvent, iodides appear to dissociate completely while bromides do not yield the expected depression possibly because of solid solution. Tetraalkylammonium and alkyl-pyridinium halides of high molecular weight are ideally dissociated in extremely dilute solution but with increasing concentration apparently form micelles.

Heat of Fusion, Entropy of Fusion and Cryoscopic Constant of the LiCl–KCl Eutectic Mixture

1958 ◽  
Vol 62 (2) ◽  
pp. 248-249 ◽  
Author(s):  
C. Solomons ◽  
J. Goodkin ◽  
H. J. Gardner ◽  
G. J. Janz
Keyword(s):  
Eutectic Mixture ◽  
Heat Of Fusion ◽  
Entropy Of Fusion ◽  
Cryoscopic Constant

On the Cryoscopic Constant of Camphor

1944 ◽  
Vol 66 (4) ◽  
pp. 658-659 ◽  
Author(s):  
John E. Ricci
Keyword(s):  
Cryoscopic Constant
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