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Deionized water ph?

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newfiebrew

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Hi guys I have a concern about the deionized water I have access to at my place of work.I checked it's PH using ph strips and it showed a ph of about 5. I was planning on mixing my house water ph 8.1 and alkalinity of 160 with this water...,is this a normal ph for deionized water,it seems low to me??

Thanks



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MaxStout

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That's sounds way too low for deionized. The strips are, at best, only accurate to within a few tenths of a pH. But being that much off tells me I wouldn't trust those particular strips.
 

ajdelange

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Given that strips often are off by several tenths this is more or less normal. Your 'deionized' water contains about 0.14 mg/L bicarbonate and about 0.8 mg/L carbonic acid. As a consequence its pH is expected to be about 5.62. This is based on atmospheric CO2 of 0.00035 atm (which is where the carbonic acid and bicarbonate come from).
 
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newfiebrew

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Thanks guys ...
the strips I used were a few years old so they were probably inaccurate.the same strips stated my tap water was 7 but the town water report said 8.1 so I guess they are running 1.1 low!


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