LiB_5O_8溶液物理化学性质研究

Physical Properties of Aqueous LiB_5O_8 Solution:Density,Viscosity,Conductivity and pH

根据Li2O-B2O3-H2O多温相图合成晶体LiB5O8·5H2O。在从稀到饱和浓度范围内测定LiB5O8水溶液在40℃和50℃下的物化性质(密度、粘度、电导率和p H),并根据相应的模型进行关联。根据文献的化学平衡常数以及测定的p H值,计算出硼酸盐溶液中存在的B(OH)3、B(OH)-4、B3O3(OH)-4、B4O5(OH)2-4和B5O6(OH)-4等物种各浓度下的摩尔分数,并给出溶液中可能存在的反应及其相应的机理。

The crystal of LiB5O8 · 5H2O was synthetized according to the phase diagram of Li2O- B2O3 - H2O. Density, conductivity, viscosity, and pH of LiB5O8solutions were measured as functions of con- centration from dilute to saturated at 40,50℃, and were analyzed according to the corresponding models. The mole fractions of the B （ OH）3, S （OH） 4, B3 O3 （0n） 4, B4 O5 （On）24- and S5 O6 （On） 4 were cal- culated according to the literature equilibrium constants of borates andpH, and relevant chemical reaction and mechanism were also suggested.