ISSN:
1573-0662
Keywords:
Henry's law
;
formic acid
;
acetic acid
;
carboxylic acids
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract The Henry's law constants, K H, of dilute aqueous formic and acetic acids were determined experimentally as a function of concentration and temperature using a new counterflow packed-column technique. K H was found to be (8.9±1.3)×103 and (4.1±0.4)×103 M atm-1 at 25°C for HCOOH and CH3COOH, respectively. The reaction enthalpies, ΔH, were found to be −51±2 kJ mol-1 and −52±1 kJ mol-1 for formic and acetic acid, respectively. These are in good agreement with calculated thermochemical values. Whereas the K H values are in reasonably good agreement with certain other experimentally determined values, K H (HCOOH) is two to three times higher than calculated thermochemical values while K H (CH3COOH) is lower than the two calculated values. The ‘best’ experimental values appear to be (11±2)×103 M atm-1 and (7±3)×103 M atm-1 for HCOOH and CH3COOH, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00162406
