NDLI: Thermodynamics of sodium 5-methylisophthalic acid monohydrate and sodium isophthalic acid hemihydrate

Content Provider	Springer Nature Link
Author	Jin, Xin Wang, Zhen Chen, San Ping Wang, Zhu Jun Gao, Sheng Li
Copyright Year	2011
Abstract	Two crystal samples, sodium 5-methylisophthalic acid monohydrate (C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) and sodium isophthalic acid hemihydrate (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s), were prepared from water solution. Low-temperature heat capacities of the solid samples for sodium 5-methylisophthalic acid monohydrate (C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) and sodium isophthalic acid hemihydrate (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s) were measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 379 K. The experimental values of the molar heat capacities in the measured temperature region were fitted to a polynomial equation on molar heat capacities (C $_{p,m}$) with the reduced temperatures (X), [X = f(T)], by a least-squares method. Thermodynamic functions of the compounds (C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) and (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s) were calculated based on the fitted polynomial equation. The constant-volume energies of combustion of the compounds at T = 298.15 K were measured by a precise rotating-bomb combustion calorimeter to be Δ$_{c}$ U(C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) = −15428.49 ± 4.86 J g$^{−1}$ and Δ$_{c}$ U(C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s) = −13484.25 ± 5.56 J g$^{−1}$. The standard molar enthalpies of formation of the compounds were calculated to be Δ $_{f}$ H m θ (C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) = −1458.740 ± 1.668 kJ mol$^{−1}$ and Δ $_{f}$ H m θ (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s) = −2078.392 ± 1.605 kJ mol$^{−1}$ in accordance with Hess’ law. The standard molar enthalpies of solution of the compounds, Δ $_{sol}$ H m θ (C$_{9}$H$_{6}$O$_{4}$Na$_{2}$·H$_{2}$O, s) and Δ $_{sol}$ H m θ (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$·1/2H$_{2}$O, s), have been determined as being −11.917 ± 0.055 and −29.078 ± 0.069 kJ mol$^{−1}$ by an RD496-2000 type microcalorimeter. In addition, the standard molar enthalpies of hydrated anion of the compounds were determined as being Δ $_{f}$ H m θ (C$_{9}$H$_{6}$O$_{4}$ $^{2−}$, aq) = −704.227 ± 1.674 kJ mol$^{−1}$ and Δ $_{f}$ H m θ (C$_{8}$H$_{4}$O$_{4}$Na$_{2}$ $^{2−}$, aq) = −1483.955 ± 1.612 kJ mol$^{−1}$, from the standard molar enthalpies of solution and other auxiliary thermodynamic data through a thermochemical cycle.
Starting Page	813
Ending Page	822
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	107
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	5-methylisophthalic acid monohydrate Sodium isophthalic acid hemihydrate Low-temperature heat capacities The standard molar enthalpy of combustion The standard molar enthalpy of solution Measurement Science and Instrumentation Polymer Sciences Inorganic Chemistry Physical Chemistry Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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