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THERMOCHIMICA ACTA · 2023 · IF 3.5

Dilution enthalpies of the binary systems (LiBO2 + H2O) and (LiB5O8 + H2O) and the ion interactions at 308.15 K

Yuqi Wang,Linxue Yan,Hua Li,Long Li,Yafei Guo,Tianlong Deng

Microcalorimeter measured the dilution enthalpies of the binary systems (LiBO 2 + H 2 O) and (LiB 5 O 8 + H 2 O) at 308.15 K and 0.1 MPa. Based on the Pitzer theory of electrolytes, their apparent molar enthalpies and the Pitzer single electrolyte parameters at 308.15 K were carried out by fitting the experimental data for the first time. Moreover, the calculated apparent molar enthalpies of LiBO 2 and LiB 5 O 8 aqueous solution according to the Pitzer ion-interaction model were consistent well with the experimental values, manifesting the high reliability of this study.

研究领域: 物理化学 · 热力学

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THERMOCHIMICA ACTA · 2019 · IF 2.251

Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at 298.15 K and the application of ion-interaction model

Fei Yuan,Long Li,Yafei Guo,Tianlong Deng

The dilution enthalpies of LiBO 2 (aq) from 0.0398 to 0.7684 mol·kg −1 and LiB 5 O 8 (aq) from 0.0521 to 0.8067 mol·kg −1 at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT 2.15. The apparent molar enthalpies on two lithium borates were obtained, and the diagrams of their apparent molar enthalpy against molality for LiBO 2 (aq) and LiB 5 O 8 (aq) were also plotted. Considering the constructers of BO 2 - and B 5 O 8 - in aqueous solution are existed as in [B(OH) 4 ]- and [B 5 O 6 (OH) 4 ]-, the Pitzer single-salt parameters ( β M X ( 0 ) L $β_{M X}^{(0) L}$ , β M X ( 1 ) L $β_{M X}^{(1) L}$ , β M X ( 2 ) L $β_{M X}^{(2) L}$ , C M X L $C_{M X}^{L}$ ) for LiB(OH) 4 and LiB 5 O 6 (OH) 4 were obtained for the first time. A comparison between the calculated apparent molar enthalpies for LiBO 2 (aq) and LiB 5 O 8 (aq) based on Pitzer model and those determined experimentally agree well, which indicate that the Pitzer single parameters of LiB(OH) 4 and LiB 5 O 6 (OH) 4 obtained are reliable.

研究领域: 物理化学 · 热化学 · 溶液化学

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Dilution enthalpies of the binary systems (LiBO2 + H2O) and (LiB5O8 + H2O) and the ion interactions at 308.15 K

Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at 298.15 K and the application of ion-interaction model