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thiocyanate lab - Murdock 1 Zak Murdock Mr Bernas Pd 7 31...

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Murdock 1 Zak Murdock Mr. Bernas Pd. 7 31 January 2007 Thiocyanate Complex Lab Abstract This experiment consisted of adding various drops of KSCN to a set amount solution of Fe(NO 3 ) 3 and HNO 3 . Before performing the experiment it was predetermined how many drops each lab station would use. Each lab station added the same number of drops of HNO 3 and Fe(NO 3 ) 3 however differed in the amount of KSCN drops added. The number of each lab station determined how many drops of KSCN were to be put into the test tube. By varying the amount of KSCN used, it was able to be determined which solution was more concentrated after using a spectrophotometer to test and analyze the solutions. Introduction The goal of this experiment was to confirm the coordination number of a complex through Lewis Acid-Base Chemistry. This specific experiment was chosen for a number of different reasons. The reactions in this experiment were very easy to run and did not leave room for a lot of error. The reactions ran were chosen due to the fact they were non-participating, color forming, easy to perform, and were able to be analyzed optically. By analyzing the solutions optically the concentration of the solutions could be
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Murdock 2 determined. However in order to be certain which solutions were more concentrated and to determine the coordination number of the complex formed, the solutions had to be tested using a spectrophotometer. The theory behind coordination numbers of complexes states that the coordination number is the complex charge times two. Upon learning this theory and performing the experiment, a hypothesis was reached. The hypothesis, based on the theory, is the reactions will form the complex, hexathiocyanatoferrate(III) and the coordination number will be equal to the charge times two.
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