Distilled water refers to the water that has been treated by the thermal separation process of distillation. In the distillation process, the low-boiling substances in water can be evaporated and condensed by using the different boiling points of different substances without using other solvents, so as to achieve the separation effect.
Distilled water can be divided into primary distilled water and multiple distilled water. Most of the first-grade distilled water still contains carbon dioxide, organic matter and other substances, while the multi-grade distilled water can remove organic matter, carbon dioxide and other substances in water with the help of potassium permanganate solution, with higher purity.
use
1. In life, when it is generally related to machines and electrical appliances, the main function of distilled water is not to conduct electricity, to ensure the stable operation of machines and to prolong the service life of electrical appliances.
2. In pharmaceutical industry, the function of distilled water is due to the low permeability effect. Wash the surgical wound with distilled water, so that the tumor cells that may remain on the wound will swell, rupture and die and lose their activity, thus preventing the tumor from planting and growing on the wound.
3. Some chemical experiments in school need distilled water, which has no electrolyte, free ions and impurities. You need to analyze specific problems to see whether it is based on its non-conductivity, low permeability, or no other ions and no chemical reaction.