Deionized Water

Definition - What does Deionized Water mean?

When all the mineral ions (both anions and cations) are completely removed from water, then the water is known as deionized water. The anions that are removed include sulphate and chloride. The cations that are removed include sodium, iron, calcium and copper. Usually deionized water is used instead of normal tap water when chemical experiments are performed so that ions in the water do not interfere with the chemical reactions.

Deionized water is also known as distilled water.

Corrosionpedia explains Deionized Water

Tap water acquires many ions as it passes through pipes and soil, which can interfere in any chemical reactions between the two substances for effective reactions. Thus, water first needs to be deionized for accurate results. Water can be deionized with the help of a process called “deionization.” This process makes use of specially produced ion exchange resins that exchange hydrogen and hydrogen ions in the tap water with dissolved minerals and then again recombines to form the water. The purest water is achieved with the assistance of deionization.

There are three types of deionization processes:

  1. Co-current deionization.
  2. Counter-current deionization.
  3. Mixed-bed deionization.

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