Is this possible? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-14-2012, 07:31 PM Thread Starter
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Is this possible?

I tested the pH of walmart distilled water. Look at this!

It looks like 6.4-6.5! Is that even possible??!?!
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post #2 of 7 (permalink) Old 06-14-2012, 08:52 PM
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absolutely possible.two weeks"old" RO water in a bucked,and I tested Ph=6,2
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post #3 of 7 (permalink) Old 06-14-2012, 08:59 PM
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this is about the right Ph of the RO/DI water

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post #4 of 7 (permalink) Old 06-14-2012, 09:29 PM
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Why do you ask if it's possible? What would you assume it would be?


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post #5 of 7 (permalink) Old 06-15-2012, 01:22 AM Thread Starter
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I thought distilled water should be 6.8-7.0, but I didn't think it would be this low.
What's odd is that this distilled water was opened right before testing the pH (meaning it has been sealed) so I don't see how the pH could be that low. The jug of distilled water is left with a big air pocket at the top; do you think that the water absorbed CO2 from that air pocket?
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post #6 of 7 (permalink) Old 06-15-2012, 01:40 AM
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Water in contact with CO2 will always absorb it. And, with near zero KH the water would have a low pH with any CO2 dissolved in it.

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post #7 of 7 (permalink) Old 06-15-2012, 01:58 AM Thread Starter
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Okay, thanks.
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