Back to category: Science Limited version - please login or register to view the entire paper. Acid rain Acid Rain Lesson Plan: pH Scale · As Mentioned above, the pH scale ranges between 0 and 14, with 7 being neutral (Figure 1). A substance with a pH less than 7 is acidic. If greater than 7, the substance is basic or alkaline. · Each one-unit change in pH is a tenfold increase or decrease in the strength of the acid or base being measured. · A unit change from pH 5 to pH 3 would be a hundred times (10 x 10) increase in acidity. · Robert Angus Smith, an English chemist, first used the phrase "acid rain" in 1852 when he noted the connection between London's polluted skies and the acidity of its rainfall. · Most Scientists agree that "normal" rainfall has a pH of 5.6. Rain in the atmosphere reacts with carbon dioxide (CO2) to form a weak carbonic acid, altering the rain pH to 5.6. · Acid rain is defined as any form of wet precipitation which has a pH less than 5.6 (on a scale of 0 to 14, with 7 being neutral). The "rain" becomes acidic when water mole... Posted by: Sean Wilson Limited version - please login or register to view the entire paper. |
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