Deionized water
Deionized Water
Deionized water (pronunciation: dee-eye-on-ized waw-ter), also known as DI water, demineralized water, or de-ionized water, is water that has had its mineral ions removed, such as cations like sodium, calcium, iron, and copper, and anions such as chloride and sulfate.
Etymology
The term "deionized water" is derived from the process of ion removal, which is called "deionization". The prefix "de-" means "removal of", and "ionized" refers to the presence of ions, which are atoms or molecules that have a net electrical charge.
Process
Deionization is a chemical process that uses specially manufactured ion-exchange resins, which exchange hydrogen and hydroxide ions for dissolved minerals, and then recombine to form water. This process can theoretically remove all traces of mineral ions, but in practice, some trace ions will remain in the water.
Uses
Deionized water is used in many industrial and scientific applications where the presence of ions could affect the results of an experiment or the quality of a product. For example, it is used in microbiology laboratories, in the pharmaceutical industry, and in the production of cosmetics and electronics.
Related Terms
- Distilled water: Water that has been boiled into vapor and condensed back into liquid in a separate container. Impurities in the original water that do not boil below or at the boiling point of water remain in the original container.
- Purified water: Water that has been mechanically filtered or processed to remove impurities and make it suitable for use.
- Hard water: Water that has high mineral content, in contrast with "soft water".
See Also
External links
- Medical encyclopedia article on Deionized water
- Wikipedia's article - Deionized water
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