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pH of water (Posted on 2003-02-11) Difficulty: 3 of 5

You have a freakish friend who only drinks pure distilled water. And keeps jars of them stored up in his basement.

When you went over to visit him, he offered you a glass. To prove to you how pure his water is, he got a pH meter and measured the pH. To his surprise, the pH was not 7!

Shouldn't the pH of pure water be 7 at 25 degrees? What happened? And was the pH greater or less than 7?

See The Solution Submitted by np_rt    
Rating: 3.1250 (8 votes)

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Solution Lower PH | Comment 6 of 13 |
Chemically speaking, distilled water is just as susceptible to deionization as everyday drinking water. Over a period of time(doesn't have to be long) the water will deionize into OH- and H30+ where the H30+ will dominate giving a lower pH. If the kid wanted to have a constant pH of 7 for his drinking pleasure, he would have to use deionized water (expensive) instead of the "cheap" distilled water.
  Posted by Kevin on 2003-02-14 04:24:00
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