Non-Trivial Behavior of the Acid-Base Balance of Pure Water near the Temperature of Its Dynamic Phase Transition


  • O.V. Khorolskyi Poltava V.G. Korolenko National Pedagogical University
  • A.V. Kryvoruchko Poltava V.G. Korolenko National Pedagogical University



pure water, acid-base balance, carbon dioxide, dynamic phase transition


The acid-base balance (pH) of distilled water at temperatures (35.0; 40.0; 42.0; 45.0) C depending on the time passed since the production of distillate is experimentally investigated. In the zero approximation, the time dependences of the acid-base balance of distilled water could be approximated by the exponential law. It is taken into account that the decrease in pH over time occurs, when water comes into contact with atmospheric air. As a result, carbon dioxide dissolves in water. In a vicinity of the Bulavin–Malomuzh temperature of 42 C, the significant oscillations of the pH values of water during measurements are observed, which allows us to obtain only the average pH values. The time dependence of the change in the acid-base balance of distilled water at a temperature of 42 C is approximated by a linear dependence. It is noted with some reservations that the temperature dependence of the coefficient of determination (R2) on the exponential approximation of the time dependences of the change in the acid-base balance of distilled water may have a minimum close to the Bulavin–Malomuzh temperature.


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How to Cite

Khorolskyi, O., & Kryvoruchko, A. (2021). Non-Trivial Behavior of the Acid-Base Balance of Pure Water near the Temperature of Its Dynamic Phase Transition. Ukrainian Journal of Physics, 66(11), 972.



Physics of liquids and liquid systems, biophysics and medical physics