POST Identification of Cations in an Unknown Compound

POST Identification of Cations in an Unknown Compound -...

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Unknown Cation Tests Jason Hsieh BB5 10/31/09 1
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Abstract: This lab’s purpose was to identify two sets of unknown cations in solution using the methods and observations that were used in the previous lab, The Separation and Identification of a Series of Cations. Using the previous data, a flowchart-like scheme was devised and involved the use of adding reagents to the solution and screening the precipitates and confirming cations using a confirmatory test. The first set was the cations: Pb 2+ , Cu 2+ , Bi 3+ , Zn 2+ , Fe 3+ . The second set was the cations: Pb 2+ , Bi 3+ , Fe 3+ , Al 3+ , Ag + . Introduction: The goal of this lab is to develop a scheme that would enable the experimenter to separate and identify cations in unknown compounds and carry out such a scheme. To do this, one must first separate and identify a list of five cations, of which all or some could be in the unknowns. Such a scheme could look like a simple test involving nickel, barium and lead ions. When choosing between adding hydrochloric and
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