Abstract
pH of 0.01 mol·kg-1 CH3COOH aqueous solutions at subcritical and supercritical conditions was measured at temperatures from (21.8 to 400.4) °C and pressures from (23.0 to 32.3) MPa by a flow-through electrochemical cell, and it changed from 3.38 at 21.8 °C and 23.0 MPa to 6.90 at 400.4 °C and 28.1 MPa. The molal equilibrium constant for the dissociation reaction of CH3COOH was determined on the basis of the measured pH, and the value varied from 4.29 × 10-10 at 400.4 °C and 28.1 MPa to 1.79 × 10-5 at 21.8 °C and 23.0 MPa. At subcritical conditions, the values showed good agreement with the literature values determined from potentiometry with a static cell, from calorimetry, and from electrical conductivity. An empirical density model for the description of the temperature and pressure dependence of the equilibrium constants was used to correlate the data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
