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Unformatted text preview: absorbance increases. The opposite is also true: as concentration decreases, absorbance decreases. Based on the graph, this relationship is acceptable because the R 2 value is 0.9962, which is only 0.0038 from being a true direct relationship of an R 2 value of 1. This means that the graph is accurate. 4. The Preparation of the Complex Ion As ammonia is added to the copper solution, the solution transforms into a deep royal blue color. As the solution is diluted and the concentration decreases, the shade of blue of the solution becomes lighter and lighter. 5. Concentration of the “Unknown” Using the equation from the graph, the concentration (M) of the unknown is approximately 0.0537. The standard deviation of the copper solutions with the unknown is ± 0.2590. The standard deviation of just the copper solutions (stock, 1 st , 2 nd , and 3 rd ) is ± 0.26916....
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This note was uploaded on 06/28/2011 for the course CH 116 taught by Professor March during the Fall '09 term at University of Alabama at Birmingham.
 Fall '09
 March
 pH

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