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What is the ph of normal rain, and at what level does the ph become dangerous?

April 26, 2017dangerous level normal pH rain

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What is the ph of normal rain, and at what level does the ph become dangerous?

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Distilled water that does not contain any carbon dioxide has a neutral ph of 7. Normal rain has a slightly acidic ph of 5.6, because carbon dioxide and water in the air react together to form carbonic acid, which is a weak acid. If it is lower than that it is really dangerous because its acidic. Information from: http://www.emsb.qc.ca/recit/acid_rain/acidrain_21/Group1/Chemist.htm http://academic.cuesta.edu/wholehealth/Level2/Lecpages/env14.htm http://www.ags.uci.edu/~colettem/clin/paper.html http://pubs.usgs.gov/gip/acidrain/2.html http://ostc.physics.uiowa.edu/~halabadleh/acid%20rain.jpg http://www.geography.learnontheinternet.co.uk/images/industry/acid.