Because in general, distilled water will be exposed to the air before use, in this process, part of carbon dioxide in the air will dissolve in distilled water and react with distilled water to generate carbonic acid, which is weakly acidic, making distilled water weakly acidic. So distilled water can also be considered as weakly acidic.
Use of distilled water
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.
Refer to the above content: Baidu Encyclopedia-Distilled Water