Adiabatic compressibility of the 4-methylpyridin-water solution as a function of the temperature, concentration, and sound frequency

The behavior of the adiabatic compressibility β S with variation in temperature t and concentration x in the aqueous solution of a nonelectrolyte is experimentally studied from the fine structure spectra of light scattering. A sign inversion of the derivative of the adiabatic compressibility with respect to the concentration β S (x) is observed in the isotherms of the dependences dβ S (x)/dx. The inversion point (concentration x 0 at which dβ S (x)/dx=0) is shifted to the region of lower concentrations as the temperature increases. In the temperature-concentration phase diagram, the dependence x 0(t) determines the line of transition from the solution structure characterized by the continuous network of the hydrogen bonds to the structure with the fragmentary network.

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