On 9/13/2011 10:16 PM, Mike Monett wrote:
Re: CSspectrographs of CS
>> I am astonished to find anyone can get down to 0.3uS. The best I
>> have seen is 0.5uS, and that is from the local Walmart.
> I use high powered rare earth magnets in the double distillation
> process.
How does that work. There are no ions in distillation, therefore
nothing for the magnets to exert a force against.
Actually there are ions in pure water. Water splits into H+ and OH-
spontaneously, that is the basis for pH measurements. In a solution pH
approximates but is not equal to p[H], the negative logarithm
<http://en.wikipedia.org/wiki/Logarithm> (base 10) of the molar
concentration <http://en.wikipedia.org/wiki/Molar_concentration> of
dissolved hydronium ions <http://en.wikipedia.org/wiki/Hydronium_ion>
(H_3 O^+ ). pH is defined as a negative decimal logarithm
<http://en.wikipedia.org/wiki/Logarithm> of the hydrogen ion
<http://en.wikipedia.org/wiki/Hydrogen_ion> activity in a solution.^[15]
<http://en.wikipedia.org/wiki/PH#cite_note-14>
For pure water that works out to be 10^-7 moles of ions per liter.
Using Avogadro constant, we find that one liter of pure water contains
6.02214179(30)×10^23
* 10-7 or approximately 6*10^16 ion pairs per liter. Although
percentage wise that is not much, that is still 120,000,000,000,000,000
ions per liter.
Marshall
