Guest guest Posted October 17, 2007 Report Share Posted October 17, 2007 Here is an excerpt from the EPA website - distilled ranges from 5.6 to 7.0 according to the EPA. So maybe we all just need to test our own distilled water to check the pH since it can vary: Were you surprised to find that the distilled water did not have a neutral pH? Pure distilled water would have tested neutral, but pure distilled water is not easily obtained because carbon dioxide in the air around us mixes, or dissolves, in the water, making it somewhat acidic. The pH of distilled water is between 5.6 and 7. To neutralize distilled water, add about 1/8 teaspoon baking soda, or a drop of ammonia, stir well, and check the pH of the water with a pH indicator. If the water is still acidic, repeat the process until pH 7 is reached. If you accidentally add too much baking soda or ammonia, either start over or add a drop or two of vinegar, stir, and recheck the pH. Last updated on Friday, June 8th, 2007. http://www.epa.gov/acidrain/education/experiment1.html ] Quote Link to comment Share on other sites More sharing options...
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