Deionized/Demineralized Water

It is quite difficult to find clear definitions and standards for distilled, demineralized and . Probably the easiest way to familiarise in the topic of producing (ultra) pure water is to start with the oldest and best-know method: distilling.
Distilled water is water that has been boiled in an apparatus called a “still” and then recondensed in a cooling unit (“condenser”) to return the water to the liquid state. Distilling is used to purify water. Dissolved contaminants like salts are left behind in the boiling pot as the water vapour rises away. It might not work if the contaminants are volatile so that they also boil and recondense, such as having some dissolved alcohol. Very elegant stills can selectively condense (liquefy) water from other volatile substances, but most distillation processes allow carry-over of at least some volatile substances, and a very little of the non-volatile material that was carried into the water vapour stream as bubbles burst at the surface of the boiling water. Maximum purity from such stills is usually 1.0 M?.cm) dissolving into the distillate the pH is generally 4.5-5.0. Additionally, you have to be careful not to re-contaminate the water after distilling it.

 

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