Abstract
The Henry's law constants, KH, of dilute aqueous formic and acetic acids were determined experimentally as a function of concentration and temperature using a new counterflow packed-column technique. KH 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.
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