Investigation of water structure changes in a three-member-system H2O-n-propanol (n-C3H7OH)-salt (NaCl, NaNO3) applying ultraacoustic and densimetric method

Abstract

It is investigated how n-propanol and salts (NaCl, NaNO₃) influence water structure dissolved together and separately. The change of water structure is investigated applying ultraacoustic and densimetric methods. It is established that maximum of ultrasonic speed, a minimum of adiabatic compressibility and the largest growth of density (beginning with the middle) are detected at 15 mass c. % of n-propanol concentration. Common combines of hydrogen thaqt are formed in the solution between the molecules of water and n-propanol stipulate all the phenomena. New terms are introduced in the work: hydration of non-organic substances, hydration of organic substances and biological hydration. It is established that ions Cl^- and NO₃^- influence the solvent H₂O – n-propanol differently in its different concentrations. It is proved that in Debay screening formula not 80, but 21 is to be taken for e.