Re: [APD] RO/pH question

["S. Hieber" <shieber at yahoo_com>]

Oh no. Not a studpid question. Did you see how many ran to
answer your question? A whole lot of folks are learning,
jsut like you and me. :-)

Scott H.
--- revance at indiana_edu wrote:
> Quoting Andrew McLeod
> <thefish at theabyssalplain_freeserve.co.uk>:
> 
> > A quote off this
> (http://www.lenntech.com/pH-and-alkalinity.htm) page:
> > "Did you know that the pH of Coca-Cola is about 2? And
> did you know that 
> > it is useless to measure the pH of RO-water or
> demiwater? Both demiwater 
> > and RO-water do not contain any buffer ions. This means
> that the pH can be 
> > as low as four, but it can also be as high as 12. Both
> kinds of water are 
> > not readily usable in their natural form. They are
> always mixed before 
> > application!"
> > 
> > Basically RO water has effectively no buffering
> capacity - it is 'dead' 
> > water with almost nothing in it, which makes it very
> reactive and 
> > susceptible to huge pH swings from a tiny change in
> acidity or alkalinity. 
> > To prepare RO water for use, simply add an appropriate
> buffer such as 
> > Seachem Equilibrium to your requirements.
> > 
> 
> 
> Sorry, now that I think about it that was a really stupid
> question. I always 
> associate a drop in pH with lowering your KH... of course
> that is because I am 
> adding co2. If I were adding something alkaline, the
> lower the KH the higher 
> the pH would go. I was just thinking of the role of KH in
> my situation, not the 
> actual definition of buffering capacity. You are right,
> after reconstituting 
> the water, the pH dropped. There must have been something
> alkaline that caused 
> the pH of the unbuffered water to spike. Thanks.
> 
> Russ
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