Abstract
The dilution enthalpies of LiBO2 (aq) from 0.0398 to 0.7684 mol·kg−1 and LiB5O8 (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 LiBO2 (aq) and LiB5O8 (aq) were also plotted. Considering the constructers of BO2- and B5O8- in aqueous solution are existed as in [B(OH)4]- and [B5O6(OH)4]-, the Pitzer single-salt parameters (βMX(0)L, βMX(1)L, βMX(2)L, CMXL) for LiB(OH)4 and LiB5O6(OH)4 were obtained for the first time. A comparison between the calculated apparent molar enthalpies for LiBO2 (aq) and LiB5O8 (aq) based on Pitzer model and those determined experimentally agree well, which indicate that the Pitzer single parameters of LiB(OH)4 and LiB5O6(OH)4 obtained are reliable.
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