RO water PH is 6.4??? - Page 2
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Old 05-06-2013, 02:05 AM   #16
Nubster
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Tap 7.6
RO/DI 6.4
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Old 05-06-2013, 02:08 AM   #17
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Quote:
Originally Posted by somewhatshocked View Post
RO/DI water has nothing in it so there are no carbonates to buffer pH at a fixed point.

Your pH sounds normal.
Yup yup. This also means that atmospheric Co2 dissolving into your water causes the pH to be lower than 7.
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Old 05-06-2013, 09:51 PM   #18
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Quote:
Originally Posted by xiaoxiy View Post
Yup yup. This also means that atmospheric Co2 dissolving into your water causes the pH to be lower than 7.

I was suspecting this, but not certain. I just remember reading that rainwater is typically ~5.5pH due to dissolved CO2
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