Qualitative Analysis Mixtures of Metal Ions

Qualitative Analysis Mixtures of Metal Ions - Qualitative...

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1. Feng, Liang, Christopher J. Musto, Jonathan W. Kemling, Sung H. Lim, and Kenneth S. Suslick. "A Colorimetric Sensor Array for Identification of Toxic Gases below Permissible Exposure Limits." ChemComm . 11 Feb. 2010. Web. 2 Oct. 2011. < ;. Qualitative Analysis Mixtures of Metal Ions George Cheng Chem 203-BB6, Waseem Ahmad 6 October, 2011 Abstract: We used a series of reaction to easily distinguish Pb 2+ , Ba 2+ , Ni 2+ because of how easily and clearly they react; and hard to distinguish Ag + , Zn 2+ ,Fe 3+ in solutions A, B, G, and H Introduction: The strategy used to identify the cations in the solutions is to compare the similarities and differences in the results from the reactions. Knowing that some of the reactions between the cations and the anions, we can take the specific anions and test for a particular cation in the solution. We can use this method to identify the components of unknown solutions. The colorimetric sensor is used to determine the concentration of a solution from how much light is absorbed by the sensor. The copper and nickel could definitely be distinguished by the colorimetric sensor because of the color already present in the solution. If the solution had both Zn 2+ and Ni 2+ we would not be able to tell apart the two if reacted with K 2 CrO 4 based off my observations. Using the sensor could help differentiate the two reacted yellow solutions, by testing the absorbance. An application of the colorimetric is shown in Professor Feng’s group study. They used the colorimetric sensor array to identify and analyze toxic chemicals and show the limits of the permissible exposure limits. 1 They are using the colorimetric sensor to find how long the toxic can be exposed. If there was an unknown solution and reacted with the anion solutions we could test whether or not there was a presence of a precipitate. Results: We took a clean 96- well plate. We filled one row of the wells with 2 drops of solution A and the next row with solution B and so on for solutions G and H as seen in Fig. 1. Once the four rows of wells were filled up with 2-3 drops of the cation mixtures, we repeated the same process we learned in lab #3, where we took the anions and dropped 1-2 drops into each well and observed the reactions as seen in Fig. 2-11. Only certain reactions would follow through due to fact that there are only three cations. Discussion: We found Pb 2+ , Ba 2+ and Zn 2+ in Solution A. We deduced from the chart that Ag + , Ba 2+ , and Zn 2+ made up the solution B. The cations in solution G were Ni 2+ , Ba 2+ , and Zn 2+ . Solution H had Fe 3+ , Zn 2+ , and Ag + . The Fe 3+ and Ni 2+ and Pb 2+ cations are the most distinguishable. The Fe 3+ has a distinct dark blue solution form after reacting with K 4 Fe(CN) 6 .The Ni 2+ cation could be determined unambiguously because of the clear light green solution. The Pb 2+ in solution A was very distinguishable since it precipitates almost every reaction with the anions. When solution H reacted to the K 4 Fe(CN) 6 it turned into a very
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