ACTIVITY COEFFICIENTS OF SILICOTUNGSTIC ACID; ULTRACENTRIFUGATION AND LIGHT SCATTERING

被引:15
作者
Johnson, James S. [1 ]
Kraus, Kurt A. [1 ]
Scatchard, George [1 ]
机构
[1] Oak Ridge Natl Lab, Div Chem, Oak Ridge, TN 37831 USA
关键词
D O I
10.1021/j100841a015
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
Activity coefficients of silicotungstic acid (0.0004-0.04 M) in aqueous solution were measured by equilibrium ultracentrifugation. The results agree with the Debye-Huckel theory for a 1-4 electrolyte, with a distance of closest approach parameter of 7.6 angstrom. A few ultracentrifugations of sodium silicotungstate indicate that the activity coefficients of this solute are similar. Turbidities of silicotungstic acid solutions are reported; they agree with the values predicted from ultracentrifugation results. Turbidities expected for two-component electrolyte-water systems at low concentration are discussed. Densities and refractive indices of silicotungstic acid solutions are presented.
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页码:1867 / 1873
页数:7
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