Nov6student - C118November6th AcidRainSections6.66.13 1 2...

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11/5/2009 1 C118 November 6th Acid Rain Sections 6.6 6.13 1 pH of rain due to atmospheric CO 1) 2 2) Sources of extra acidity “Acid” Rain is pH < 5.3 Sources and Emission trends Chapter 6 End of Chapter Problems: 15, 17, 18, 21, 22, 23, 34, 36, 40 pH of rainfall in 2002 Measured at Central Analytical Laboratory National Atmospheric Deposition Program National Trends http://nadp.sws.uiuc.edu pH of rain is _________ everywhere.
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11/5/2009 2 Group Work/Clicker Question You would like to know the K a value for carbonic acid (H CO ) to understand how atmospheric CO (H 2 CO 3 ) to understand how atmospheric CO 2 concentrations affect the pH of rain. In the laboratory, you prepare a 0.1 M solution of carbonic acid (H 2 CO 3 ) and measure the pH to be 367 3.67. Calculate the K a of carbonic acid. 1) H 2 CO 3 H + + HCO 3 I0 . 1 0 0 C x+ x + x E0 . 1 xx x 2) The value of x can be found because the pH is known to be 3.67. 3.67 = log[H+] Therefore, [H+] = 10 3.67 = 2.14 x 10 4 M 3) Plug in values to solve for K a [] [ ] 7 4 2 4 3 2 3 10 5 . 4 ) 10 1 . 2 1 . 0 ( ) 10 14 . 2 ( + = = = x
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This note was uploaded on 07/02/2011 for the course CHEM-C 118 taught by Professor Flood during the Spring '10 term at Indiana.

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Nov6student - C118November6th AcidRainSections6.66.13 1 2...

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