Abstract
The influence of pressure (0.1–1000 MPa) on the structure of aqueous solutions of NaCl (1.91–3.08 m) at constant temperatures of 298 and 623 K was studied by the integral equation method. The most substantial structural rearrangement was found to occur at pressures exceeding 150 MPa. Solution structure formation at 298 K was characterized by a substantial decrease in interparticle distances and a baric distortion of the tetrahedral network of water, which resulted in an increase in the hydration of ions and a decrease in the fraction of ion pairs. Structure changes under compression conditions at 623 K were similar to those observed at 298 K, but the network of water H-bonds was already destroyed in solutions at the higher temperature, and hydration-separated ion pairs did not form over the whole pressure range studied. Ions partially dehydrated at 623 K virtually fully restored the hydration spheres they had at 298 K as the pressure increased to 1000 MPa.
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Original Russian Text © M.V. Fedotova, 2007, published in Zhurnal Fizicheskoi Khimii, 2007, Vol. 81, No. 5, pp. 836–842.
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Fedotova, M.V. The influence of pressure on the structure of aqueous solutions of NaCl over the pressure range 0.1–1000 MPa according to the integral equation method. Russ. J. Phys. Chem. 81, 721–726 (2007). https://doi.org/10.1134/S0036024407050111
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DOI: https://doi.org/10.1134/S0036024407050111