Sound velocity and density measurements for H2O and D2O solutions of hexamethylphosphoric triamide (HMPT), [(CH3)2N]3PO at 25 °C have been carried out. The concentration dependence of the molar volumes and adiabatic compressibilities calculated therefrom are interpreted in terms of the water structure. The differences found between the H2O and D2O solutions are similarly explained.
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