What is deionized water?

Answer
Deionized water is water that has had all of its ions removed, making it one of the purest forms of water. The key points about deionized water are:
  • Deionization is the process of removing ions, such as salts and minerals, from water through ion exchange resins. This leaves behind only water molecules (H2O).
  • Deionized water has very low electrical conductivity and high resistivity, typically 0.055 μS/cm and 18.2 MΩ/cm respectively. This makes it an excellent solvent for many applications.
  • Deionized water is commonly used in medical, pharmaceutical, and electronics manufacturing applications where extremely pure water is required. It is used to prevent unwanted chemical reactions or contamination.
  • While deionized water is safe to drink, it lacks the beneficial minerals found in regular drinking water and has a flat taste. It is not recommended as a regular drinking water source.
  • Deionized water can be corrosive to certain materials due to its lack of ions, so it must be used carefully.
In summary, deionized water is a highly purified form of water with almost all dissolved ions removed, making it ideal for specialized industrial and laboratory applications, but not suitable as a regular drinking water replacement.
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