Electrical conductances of aqueous Na2SO4, H2SO4, and their mixtures:: Limiting equivalent ion conductances, dissociation constants, and speciation to 673 K and 28 MPa

被引:52
作者
Hnedkovsky, L
Wood, RH [1 ]
Balashov, VN
机构
[1] Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA
[2] Inst Chem Technol, Prague, Czech Republic
[3] Inst Expt Mineral, Chernogolovka 142432, Moscow District, Russia
关键词
D O I
10.1021/jp045707c
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 electrical conductivities of aqueous solutions of Na2SO4, H2SO4, and their mixtures have been measured at 373-673 K at 12-28 MPa in dilute solutions for molalities up to 10(-2) mol kg(-1). These conductivities have been fit to the conductance equation of Turq et al.(1) with a consensus mixing rule and mean spherical approximation activity coefficients. Provided the concentration is not too high, all of the data can be fitted by a solution model that includes ion association to form NaSO4-, Na2SO40, HSO4-, H2SO40, and NaHSO40. The adjustable parameters of this model are the dissociation constants of the SO4- species and the H+, SO4-2, and HSO4- conductances (ion mobilities) at infinite dilution. For the 673 K and 230 kg m(-3) state point with the lowest dielectric constant, epsilon = 3.5, where the Coulomb interactions are the strongest, this model does not fit the experimental data above a solution molality of 0.016. Including the species H-9(SO4)(5)(-) gave satisfactory fits to the conductance data at the higher concentrations.
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页码:9034 / 9046
页数:13
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