Why won't distilled or reverse osmosis water work just as well? Is it a good idea to use de-ionised water in steam generator irons? Unless the water is specifically for human consumption, it might be a bad idea to drink it because it could contain traces of the de-ionizing resins. But, distilled water doesn't... read more. But what I learned from researching this topic was that pure water is actually an excellent insulator and does not conduct electricity. Tom Brothwood. Salt water contains charged particles called ions, eg- Na+, Cl-.

Then it eventually dries into tiny circles (not sure if its a non-ionic residue or micro droplets - they're typically 1 to 10 microns in diameter). It still may contain other organic junk. I am cleaning solar panels and was told to use deionized water.

We make EDI or E-Cell units (Electrodeionization), as well as other water processing modules and systems. De-ionized water is water that lacks ions coming from sodium, calcium etc.

Is de-ionized water cheaper? I work at G.E.

This is the first indication as to why deionised water is not very conductive; its whole purpose revolves around its lack of ion content. © 1994 - 2020    The Board of Trustees at the University of Illinois :: University of Illinois at Urbana-Champaign. If I put the wafer in an oven at 80C for an hour they don't change. These help in conduction of electricity. As it currently stands, nature has made it such that naked electrons can’t flow through water or solutions, … In the lab when we wanted de-ionized water on demand, we'd usually use columns of de-ionizing resin, available commercially.

Once these ions are removed deionized water is a poor conductor of electricity. Why can’t electrons flow through deionized water to make it conduct? You can monitor the output with a conductivity meter. Deionized Water (We call it "DI water" in the chemistry labs) is just what it sounds like: Water that has the ions removed. If you combine reverse osmosis followed by deionization, either by DI resin filters or EDI units, this is probably the best way to get water as clean as it needs to be. Tap water is usually full of ions from the soil (Na. But the resistivity is more than 10 mohm .Do this will cause the silicon chip problem? Water and Process technologies. Most water we come into contact with, such as tap water or not completely distilled bottle water, contain impurities that turn water into a conductor. That way whatever organic gunk it gave off would be removed in the second stage. Why my factory DI water is very dirty ! I hate to give technical advice on something where I have no direct experience, but I can't think of any reason why you should avoid distilled or reverse-osmosis water.

What are these small circles or why doesn't the DI water completely disappear? Deionized water is water in which chemists use a technique called ion exchange to remove or exchange the dissolved ions in it. When you say that the water is dirty even though it has high resistivity (Is that 10 Meg ohm-cm? There are only neutral molecules, and these neutral molecules lack a charge. Depending on how pure you really need the water to be, you may be able to use one as cheap as under $200. [I can't tell if this is getting through or not because there is no message if it did or didn't - it just comes back to the same page with a new challenge. Distilled water is purer. In response to Mike W.'s question, the likely reason for using deionized water is to avoid the effect of contaminant ions on the electrical parameters of the panel. De-ionized water has usually been run through an ion-exchange resin that pulls out most anions and cations. The EDI cells I think perform better than simply filtering with ion exchange resins because they don't leave any residue behind in the water from the resins themselves. How about adding a message "It didn't work - try again.". It seems that distilled water would be a better choice than deionized water. Perhaps with distilled water or reverse-osmosis purified water you'd not get those residues. If you use reverse osmosis, you can still have ions left over in the water. I use distilled water for topping up my car’s battery. The reason being is that the cooling water passes over the high voltage contacts on both ends of the stimulation lamp while the unit is firing and therefore must be as non-conducting as possible. Completely deionized water (in other words, absolutely ‘pure’ water) doesn’t have any ions. That makes me think the circles are dried out residue as I'd have thought pure water should evaporate away to nothing. Best regards Alternatives are old-fashioned stills (not very convenient or energy efficient) or reverse-osmosis systems. When I put a small droplet of deionized water onto an ultra clean silicon wafer and view through a microscope I noticed the following: As evaporation progresses, I see hundreds of tiny bubbles moving around then eventually pulling to the edge of the drop (the coffee ring effect I think). If you want absolutely pure water, then you can follow this up with distillation. In distilled water, there are no impurities and thus no ions. Distilled water does not conduct electricity, because it doesn't has free charges. The question, however, was why distilled water or water purified by reverse osmosis, each also free of ions, wouldn't work. Industrial users seem to generally prefer the exchange resins, I suppose for price reasons. It sounds like you've done just the tests needed to show that these spots are from some residue.

They're replaced with H+ and OH-, which recombine to form water. Any form of deionized water (distilled, ion-exchange-resin, reverse osmosis) should work for this. Thanks for the info. But not all impurities can do so, only those that can contribute ions, such as salt. Properly distilled water or reverse-osmosis purified water should generally be cleaner than water that's just been run through an ion exchange resin. I have one small quibble. That makes sense. Deionized Water (We call it "DI water" in the chemistry labs) is just what it sounds like: Water that has the ions removed. ...a practical application to the deionized water question: My friends and I work on our own cars. Any way to measure the water cleaness ? Sorry I can't be more specific. Water that would be considered "pure" would be distilled water (water condensed from steam) and deionized water (used in laboratories), although even water … I’ve heard that this is a problem with some deionized water intended for industrial use. Quoting the textbook from my IC Engineering classes [Introduction to Integrated Circuit Engineering by D. K. Reinhard], "One improperly cleaned beaker or inadvertent contact with tap water can send threshold voltages into the stratosphere." For radiator use there is probably not much difference. I hope this helps. Similarly if I put the wafer in a vacuum oven at 80C for an hour. The output is not 100% de-ionized, but then nothing really is.

More Experiments On Electricity Certainly the water needs to be nearly free of ions, as you say. For the combined resin+reverse osmosis method, wouldn't it make sense to use the resin first? As a result, there is no flow of charge through water, so pure water doesn’t conduct electricity. Without free charges, electricity is not possible. I keep hearing about using distilled or deionized water in the radiator to extend the life of the aluminum and solder in a car radiator.

), I guess you mean it has some dust in it. Tap water is usually full of ions from the soil (Na +, Ca 2+), from the pipes (Fe 2+, Cu 2+), and other sources.Water is usually deionized by using an ion exchange process. What would be the least corrosive? Will such use prevent or reduce mineral build up in the appliance?

The Wikipedia article on this topic looks pretty good to me: . That is why you MUST NOT touch electrical outlets or switches with wet hands. =8o). In our Laser Welder, the manual says to use only DI Water in the cooling system. Ions and Conductivity Ions in water are important for conductivity because they behave like stepping stones which the …

Our guess was that they are more expensive. How can we make de- ionised water on site for our MeCanolav degreasing facility and what checks can we perfom on site to authenticate its purity and that it is 100% de-ionised.

Electricity, is flow of charges.

Occasionally you have to replace the columns. That can still leave traces of other gunk, and I guess that's what you're seeing.