Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9694263 | Thermochimica Acta | 2005 | 4 Pages |
Abstract
The enthalpies of solution of (NH4)2B4O7·4H2O (cr) and NH4B5O8·4H2O (cr) in approximately 1 mol dmâ3 aqueous hydrochloric acid solution, as well as the enthalpy of solution of NH4Cl (cr) in aqueous (hydrochloric acid + boric acid) have been measured by using a microcalorimeter. From these results and other auxiliary data, the standard molar enthalpies of formation ÎfHm0 of (NH4)2B4O7·4H2O (cr) and NH4B5O8·4H2O (cr) have been derived to be (â4313.74 ± 3.26) and (â4703.56 ± 4.03) kJ molâ1 at 298.15 K, respectively. Some other thermodynamic properties of the title borates, such as the standard molar entropies of formation and the standard molar entropies have also been calculated.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Wang Jiang, Zhu Lixia, Wang Bo, Xia Shuping,