The pH scale
![Figure - The pH scale](/web/20061213225651im_/https://www.ec.gc.ca/water/images/manage/qual/a3p7e-sm-rev.gif)
The acidity of a water sample is measured on a pH scale. This scale ranges from 0 (maximum acidity) to 14 (maximum alkalinity). The middle of the scale, 7, represents the neutral point. The acidity increases from neutral toward 0.
Because the scale is logarithmic, a difference of one pH unit represents a tenfold change. For example, the acidity of a sample with a pH of 5 is ten times greater than that of a sample with a pH of 6. A difference of 2 units, from 6 to 4, would mean that the acidity is one hundred times greater, and so on.
Normal rain has a pH of 5.6 slightly acidic because of the carbon dioxide picked up in the earth's atmosphere by the rain.
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