Precipitation: Its Acidic Nature

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Science  08 Aug 1975:
Vol. 189, Issue 4201, pp. 455-457
DOI: 10.1126/science.189.4201.455


A comparison of the free hydrogen ion concentration and the total hydrogen ion concentration of rain samples shows that rain is a weak acid. The weak acid nature of rain casts doubt on the concepts that the acidity of rain is increasing and that these increases are due to strong acids such as sulfuric acid.