The paper considers a triple complex system of tomato, water and sodium nitrate. Taking into account the average macronutrient composition and moisture content of field and greenhouse tomatoes, physicochemical modeling of the system was carried out tomato-water-sodium nitrate. The hydrogen index of tomato was determined at various temperatures and it was noted that tomato medium was acidic. It is shown that with an increase in the content of sodium nitrate in the system: tomato - water - sodium nitrate within the temperature range from 278 to 293 K, the hydrogen index of tomato increases, i.e. the process of neutralizing the acidic medium based on sodium hydroxide proceeds. The calculated hydrogen value of tomato corresponds to the experimental values of pH = 3.3-4.38. The obtained results made it possible to determine the distribution of individual simple and complex cations and anions in water-salt solution, as well as to establish the values of redox potential, and thereby revealed the antioxidant nature of tomato.
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