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The electrical conductivities of aqueous solutions of Li2SO4 and K2SO4 have been measured at 523–673 K at 20–29 MPa in dilute solutions for molalities up to 2 × 10−2 mol kg−1. These conductivities have been fitted to the conductance equation of Turq, Blum, Bernard, and Kunz with a consensus mixing rule and mean spherical approximation activity coefficients. In the temperature interval 523–653 K, where the dielectric constant, e, is greater than 14, the electrical conductance data can be fitted by a solution model which includes ion association to form MSO 4 - , M 2 S O 4 0 , and HSO 4 - , where M is Li or K. The adjustable parameters of this model are the first and second dissociation constants of the M2SO4. For the 673 K and 300 kg m−3 state point where the Coulomb interactions are the strongest (dielectric constant, e = 5), models with more extensive association give good fits to the data. In the case of the Li2SO4 model, including the multi-ion associate, Li 16 ( SO 4 ) 8 0 , gave an extremely good fit to the conductance data. |
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