Distilled water?
07-29-2005, 05:55 PM
#16
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Garth,
Interesting. I think you're saying that Dexcool-like products are designed to chemically bond with the ingredients of tap water and prevent precipitation on or bonding with the metal surfaces. I would expect that very little solvent activity would occur before ionic equilibrium was reached.
Interesting. I think you're saying that Dexcool-like products are designed to chemically bond with the ingredients of tap water and prevent precipitation on or bonding with the metal surfaces. I would expect that very little solvent activity would occur before ionic equilibrium was reached.
07-29-2005, 06:45 PM
#17
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[QUOTE=Randy V
Are you sure you aren't referring to 'deionized' water here, Garth? Distilled water maintains the anion and cation bonds with Mg, Ca, etc. while removing the excess 'unbonded' molecules. It's no more corrosive than tap water, just less 'junk' in it.[/QUOTE]
Deionizing generally only removes the divalent cations (Ca++ & Mg++) that create relatively insoluble precipitates - by replacing them with common table salt (Na+): Neither it nor reverse osmosis (RO) removes the other inorganic baggage, dissolved CO2, or all the dissolved organic stuff (tannins, etc.).
Distillation removes all of these, leaving a more 'pure' water: the more pure water is, the more aggressive/corrosive it is in attempting to establish a certain ionic strength - ie., it dissolves stuff until an equilibrium is established. This is good for surface plating type of corrosion inhibiter chemicals, as in the 'green' stuff - tap water can deplete these inhibitors by forming precipitates, etc. before the plating action occurs.
Again, the reverse applies to the organic acid inhibitors, as in the dexcool family: they are not consumed by normal dissolved stuff in tap water - conversely, they allow the water to dissolve enough of whatever is available until a stable 'buffered' ionic strength is established and maintained by the OAs present. If one starts off with water that is reasonably loaded up (tap water), there is a lesser tendency to dissolve the impeller of a water pump (yea plastic
), or whatever else than were distilled water used.
... or so one can surmise seeing that the dexcool folks actually recommend tap water - at least on the containers available here.
Are you sure you aren't referring to 'deionized' water here, Garth? Distilled water maintains the anion and cation bonds with Mg, Ca, etc. while removing the excess 'unbonded' molecules. It's no more corrosive than tap water, just less 'junk' in it.[/QUOTE]
Deionizing generally only removes the divalent cations (Ca++ & Mg++) that create relatively insoluble precipitates - by replacing them with common table salt (Na+): Neither it nor reverse osmosis (RO) removes the other inorganic baggage, dissolved CO2, or all the dissolved organic stuff (tannins, etc.).
Distillation removes all of these, leaving a more 'pure' water: the more pure water is, the more aggressive/corrosive it is in attempting to establish a certain ionic strength - ie., it dissolves stuff until an equilibrium is established. This is good for surface plating type of corrosion inhibiter chemicals, as in the 'green' stuff - tap water can deplete these inhibitors by forming precipitates, etc. before the plating action occurs.
Again, the reverse applies to the organic acid inhibitors, as in the dexcool family: they are not consumed by normal dissolved stuff in tap water - conversely, they allow the water to dissolve enough of whatever is available until a stable 'buffered' ionic strength is established and maintained by the OAs present. If one starts off with water that is reasonably loaded up (tap water), there is a lesser tendency to dissolve the impeller of a water pump (yea plastic
), or whatever else than were distilled water used. ... or so one can surmise seeing that the dexcool folks actually recommend tap water - at least on the containers available here.
07-29-2005, 07:08 PM
#19
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Originally Posted by Garth S
Deionizing generally only removes the divalent cations (Ca++ & Mg++) that create relatively insoluble precipitates - by replacing them with common table salt (Na+)...Distillation removes all of these, leaving a more 'pure' water...
Deionized water is passed over cation and anion resin beds, resulting in 'pure' water that is indeed very corrosive - and much more pure than simple distilled water.
For parts per billion gas chromatograph dilutions we would use deionized water that was then further cleansed through nano filtration.
Look it up - it's pretty much common knowledge in the laboratory and chemical processing fields.
07-29-2005, 07:23 PM
#21
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Originally Posted by Randy V
I think you're referring to 'softened' water there.
Deionized water is passed over cation and anion resin beds, resulting in 'pure' water that is indeed very corrosive - and much more pure than simple distilled water.
For parts per billion gas chromatograph dilutions we would use deionized water that was then further cleansed through nano filtration.
Deionized water is passed over cation and anion resin beds, resulting in 'pure' water that is indeed very corrosive - and much more pure than simple distilled water.
For parts per billion gas chromatograph dilutions we would use deionized water that was then further cleansed through nano filtration.
- actually, very correct for the point is that of agressive corrosion, regardless of how the water is purified. I was referring to the 'deionized' stuff that mere mortals can access - you are correctly referring to the elixir of electrochem and bio, etc. research labs: ultra pure, degassed, miniscule conductivity approaching the theoretical, etcI'm just a country hick pouring soft well water into his dexcool - or using it chilled in a side glass to accompany a smooth single malt - ummmmmm gooood
The latter is one of the better premixes available, should one so choose ...
07-29-2005, 09:14 PM
#22
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Originally Posted by Garth S
Deionizing generally only removes the divalent cations (Ca++ & Mg++) that create relatively insoluble precipitates - by replacing them with common table salt (Na+): Neither it nor reverse osmosis (RO) removes the other inorganic baggage, dissolved CO2, or all the dissolved organic stuff (tannins, etc.).
Distillation removes all of these, leaving a more 'pure' water: the more pure water is, the more aggressive/corrosive it is in attempting to establish a certain ionic strength - ie., it dissolves stuff until an equilibrium is established. This is good for surface plating type of corrosion inhibiter chemicals, as in the 'green' stuff - tap water can deplete these inhibitors by forming precipitates, etc. before the plating action occurs.
Again, the reverse applies to the organic acid inhibitors, as in the dexcool family: they are not consumed by normal dissolved stuff in tap water - conversely, they allow the water to dissolve enough of whatever is available until a stable 'buffered' ionic strength is established and maintained by the OAs present. If one starts off with water that is reasonably loaded up (tap water), there is a lesser tendency to dissolve the impeller of a water pump (yea plastic ), or whatever else than were distilled water used.
... or so one can surmise seeing that the dexcool folks actually recommend tap water - at least on the containers available here.
Distillation removes all of these, leaving a more 'pure' water: the more pure water is, the more aggressive/corrosive it is in attempting to establish a certain ionic strength - ie., it dissolves stuff until an equilibrium is established. This is good for surface plating type of corrosion inhibiter chemicals, as in the 'green' stuff - tap water can deplete these inhibitors by forming precipitates, etc. before the plating action occurs.
Again, the reverse applies to the organic acid inhibitors, as in the dexcool family: they are not consumed by normal dissolved stuff in tap water - conversely, they allow the water to dissolve enough of whatever is available until a stable 'buffered' ionic strength is established and maintained by the OAs present. If one starts off with water that is reasonably loaded up (tap water), there is a lesser tendency to dissolve the impeller of a water pump (yea plastic
), or whatever else than were distilled water used. ... or so one can surmise seeing that the dexcool folks actually recommend tap water - at least on the containers available here.
What's the best tap water...or are there any standards for Dex-cool?
N?
07-30-2005, 12:10 AM
#24
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Originally Posted by Normy
Ok...good description of what is going on in the cooling system. But I have a question for you: How does Fort Lauderdale city water compare with...say, Detroit, Michigan water? Or California water?
What's the best tap water...or are there any standards for Dex-cool?
N?
What's the best tap water...or are there any standards for Dex-cool?
N?
Justin, this was started as innocuous fun in response to a near universal call for some form of purified water - when the manufacturers label on some long life antifreeze clearly specifies tap water.
Just think what you could have started had you asked what water to use in an intercooler for a SUPERCHARGER .. and how it would effect the dyno results
