Volumetric properties of aqueous electrolytes at high temperature .3. B(OH)(3)-NaBx(OH)(3x+1)-NaOH mixtures up to 523 K

被引:4
作者
Ganopolsky, JG [1 ]
Bianchi, HL [1 ]
Corti, HR [1 ]
机构
[1] UNIV BUENOS AIRES,FAC CIENCIAS EXACTAS & NAT,INST QUIM FIS MAT MEDIO AMBIENTE & ENERGIA,RA-1428 BUENOS AIRES,DF,ARGENTINA
关键词
densities; boric acid sodium borate mixtures; partial molar volumes; high temperature; polyborates;
D O I
10.1007/BF00972894
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The densities of aqueous solutions resulting from the partial neutralization of boric acid with sodium hydroxide were measured as a function of concentration, between 375 K and 523 K at pressures close to saturation. The speciation in this system is complex, di- and triborate ions are present in addition to the monoborate ion. The concentration dependence of the apparent partial molar volume of the mixture can be described using the Fitter equation only if the formation of the polyborate species in the concentrated solutions is taken into account. The partial molar volumes at infinite dilution for the diborate and triborate anions, obtained by assuming ideal mixing, are reported in the range of temperature studied.
引用
收藏
页码:391 / 399
页数:9
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