Figure 13.18 Precipitation pH values for the United States in 2011 In the United States, acid precipitation is most severe in the Northeast. 5.9 4.8 5.7. MORE STRONGLY 14 ALKALINE •6.2 13 -LYE 5.1. 12 -AMMONIA 5.6. 5.5 4.8. The pH scale measures the 11 degree of acidity or alkalinity of a solution. Each whole 10 4.8. number indicates a tenfold difference. Unpolluted rain has a pH of about 5. 5.3 - BAKING SODA LESS ACIDIC „DISTILLED WATER (NEUTRAL) 52-5.3 5.1- 5.2 5.0 - 5.1 49 -5.0 4.8 -4.9 47- 4.8 4.6 - 4.7 4.5-4.6 44 -4.5 43-4.4 4.8. 4.6 . 9. 5.0. 5.0. 5.0. CARBONATED SOFT DRINK 4.8 MORE -LEMON JUICE 2 <4.3 ACIDIC 1 -STOMACH ACID MORE STRONGLY ACIDIC pH VALUE

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