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Title: The apparent molar heat capacity of aqueous hydrochloric acid from 10 to 140/sup 0/C

Abstract

The apparent molar heat capacity of aqueous HCl has been measured at temperatures of 25, 76, 103, 125 and 140 C and molalities from 0.1 to 1.02 mol-kg/sup -1/ using a Picker flow microcalorimeter. The results were analyzed using the Pitzer and the Helgeson-Kirkhan-Flowers models to derive standard state heat capacities. The fitted parameters were also used to extrapolate the standard EMF of the silver-silver chloride reference electrode at steam saturation from 0 to 200 C and the mean ionic activity coefficient at 225 C, with an accuracy at the highest temperature of 2 MeV and 4%, respectively. The results confirm that experimental values of the apparent molar heat capacity to just over 100 C can be used to extrapolate standard state and excess Gibbs energies above 250 C, when the corresponding enthalpies at 25 C are accurately known. This work was carried out owing to the importance of HCl as a reference solute for measuring and tabulating the thermodynamic properties of electrolyte solutions at the elevated temperatures and pressures encountered in in situ bitumen recovery operations, steam generators and natural geothermal systems.

Authors:
; ;
Publication Date:
Research Org.:
Oil Sands Research Dept., Edmonton, Alberta
OSTI Identifier:
6973301
Resource Type:
Journal Article
Journal Name:
J. Solution Chem.; (United States)
Additional Journal Information:
Journal Volume: 15:1
Country of Publication:
United States
Language:
English
Subject:
04 OIL SHALES AND TAR SANDS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; HYDROCHLORIC ACID; APPARENT MOLAL VOLUME; SPECIFIC HEAT; BITUMENS; CALORIMETRY; COMPILED DATA; ELECTRODES; ELECTROLYTES; ELECTROMOTIVE FORCE; ENHANCED RECOVERY; FREE ENTHALPY; GEOTHERMAL SYSTEMS; HIGH TEMPERATURE; MEDIUM TEMPERATURE; SILVER; SILVER CHLORIDES; STEAM GENERATORS; BOILERS; CHLORIDES; CHLORINE COMPOUNDS; DATA; ELEMENTS; ENERGY; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; INFORMATION; INORGANIC ACIDS; METALS; NUMERICAL DATA; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; RECOVERY; SILVER COMPOUNDS; TAR; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; VAPOR GENERATORS; 040401* - Oil Shales & Tar Sands- In Situ Methods, True & Modified; 400201 - Chemical & Physicochemical Properties

Citation Formats

Tremaine, P R, Barbero, J A, and Sway, K. The apparent molar heat capacity of aqueous hydrochloric acid from 10 to 140/sup 0/C. United States: N. p., 1986. Web. doi:10.1007/BF00646308.
Tremaine, P R, Barbero, J A, & Sway, K. The apparent molar heat capacity of aqueous hydrochloric acid from 10 to 140/sup 0/C. United States. https://doi.org/10.1007/BF00646308
Tremaine, P R, Barbero, J A, and Sway, K. Wed . "The apparent molar heat capacity of aqueous hydrochloric acid from 10 to 140/sup 0/C". United States. https://doi.org/10.1007/BF00646308.
@article{osti_6973301,
title = {The apparent molar heat capacity of aqueous hydrochloric acid from 10 to 140/sup 0/C},
author = {Tremaine, P R and Barbero, J A and Sway, K},
abstractNote = {The apparent molar heat capacity of aqueous HCl has been measured at temperatures of 25, 76, 103, 125 and 140 C and molalities from 0.1 to 1.02 mol-kg/sup -1/ using a Picker flow microcalorimeter. The results were analyzed using the Pitzer and the Helgeson-Kirkhan-Flowers models to derive standard state heat capacities. The fitted parameters were also used to extrapolate the standard EMF of the silver-silver chloride reference electrode at steam saturation from 0 to 200 C and the mean ionic activity coefficient at 225 C, with an accuracy at the highest temperature of 2 MeV and 4%, respectively. The results confirm that experimental values of the apparent molar heat capacity to just over 100 C can be used to extrapolate standard state and excess Gibbs energies above 250 C, when the corresponding enthalpies at 25 C are accurately known. This work was carried out owing to the importance of HCl as a reference solute for measuring and tabulating the thermodynamic properties of electrolyte solutions at the elevated temperatures and pressures encountered in in situ bitumen recovery operations, steam generators and natural geothermal systems.},
doi = {10.1007/BF00646308},
url = {https://www.osti.gov/biblio/6973301}, journal = {J. Solution Chem.; (United States)},
number = ,
volume = 15:1,
place = {United States},
year = {1986},
month = {1}
}