Experiment 10 -...

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Acid Rain: Environmentally Important Reactions of Nitrogen and Sulfur Oxides Sidney Sherrill Emily Teeter Nick Zahn April 11 th , 2010 Chem 1212K-A01 I certify this work is my own. ______________________________
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Data/Results Analysis Part A. Drop Compound Color of Indicator Solution more or less acidic than rainwater 1 2 M H SO yellow more acidic 2 "rain" water; D.I. water lighter green more acidic 3 2 M NH blue less acidic 4 NaHCO blue less acidic 5 NaNO blue less acidic 6 Na SO blue less acidic 7 Indicator only blue less acidic In this section of the experiment, 7 drops of distilled water mixed with  bromocresol green were placed on a Petri dish in the pattern below.  A drop of  each compound listed in the table above was then added to its corresponding  drop on the Petri dish.  If the solutions became turned lighter in color, then a  hydrogen atom in the added compound transferred to the water molecules,  creating hydronium ions and turning the solution more acidic.  If the solution  turned darker in color, then a hydrogen atom from the water molecules  transferred to the compound molecules, creating hydroxide ions and turning the  solution more basic.
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  Questions answered with observations: a. What color indicates the presence of saturated water?   Green indicates the  presence of  CO2  saturated water.  Water saturated with   is slightly  acidic and has a pH of roughly 5.6. b. What color is HIn?  - In ?   HIn is indicator that has reacted with hydronium  ions.  This turns the solution lighter in color, to a light green or yellow, and  indicates an acidic solution.   - In  is indicator that has reacted with hydroxide  ions.  This reaction turns the solution darker in color, to a blue, and indicates  a basic solution. c. In this indicator system, what color would be seen at pH = 3,4,5,6 and 7?  The colors seen would be yellow, yellow-green, green-blue, dark blue-green,  and dark blue respectively.  With low pH’s, the hydroxide’s in the solution  react with the indicator in respective quantity and turn the solution lighter in  color.  With high pH’s, the hydronium’s in the solution react with the  indicator in respective quantity and turn the solution darker in color. d. Why is bromocresol green a good indicator for this set of experiments?  Bromocresol green is a good indicator because it demonstrates color changes  close to the pH of rainwater (~5.6). e.
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This note was uploaded on 09/07/2011 for the course CHEM 1212 taught by Professor Dr.johnzhang during the Spring '11 term at Georgia Institute of Technology.

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Experiment 10 -...

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