Dynamics of changes in the temperature coefficient of electrical conductivity of distilled water in conductometric cells during heating and cooling

The problem of taking into account the influence of air on the properties of distilled water is considered, namely the lack of a single generally accepted method for calculating such an influence. The sensitivity of the structure of water to the influence of external factors is described and the possibility of recording and studying such factors based on changes in the temperature coefficient of electrical conductivity of water is shown. The dependences of the temperature coefficient of electrical conductivity of distilled water on the rate of change in water temperature, the degree of filling of conductometric cells, as well as on the intensity of carbon dioxide exchange between water and air across their interface have been studied. It is noted that currently these exchange processes are studied insufficiently. A hardware-software measuring complex has been developed and manufactured to study the temperature coefficient of electrical conductivity of water in the temperature range of 20–55 °C. The temperature coefficient of electrical conductivity of water was measured in sealed conductometric cells at different degrees of filling with distilled water and various water heating and cooling rates. The degree of cell filling varied from 10 to 100%, and the water temperature variation rate—from 0.04 to 2.00 °C/min. With a constant heating and cooling time of 15 min in all experiments, the rate was varied by changing the temperature of the heating element. The integral temperature coefficient of electrical conductivity is calculated based on the initial and final values of electrical conductivity and water temperature in each measurement cycle. The dependences of the temperature coefficient of electrical conductivity on the water temperature variation rate at several constant values of the degree of cell filling were obtained. It was shown that at a constant water-to-air volume ratio in the cell and increased water heating rate, the temperature coefficient of electrical conductivity of water decreases by 19–22%. It has been established that at a constant water heating rate, the temperature coefficient of electrical conductivity of water decreases by 40–42% as the cellular water volume drops. The obtained results can be used to quantify the coefficient of carbonic acid dissociation, mobility of hydrogen ions, as well as intensity of the gas exchange process at various external conditions affecting water. Refinement of data on the electrical conductivity of wate