Discussion4 - Lauren Taranow 10-9-11 Unique: 51070 lmt827...

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Lauren Taranow lmt827 10-9-11 Unique: 51070 Discussion - Experiment 4: Qualitative Analysis of Cations This experiment demonstrates how to develop a flow chart using knowledge of basic solubility rules to help with the qualitative analysis of cations in a substance. After the scheme is constructed, the addition of solutions used in the flowchart and centrifugation will separate ions into identifiable precipitates. Hydrochloric acid was added to the mixture of cations at the beginning of the procedure because the chlorides of Ag + , Pb 2+ , and Hg 2 2+ are not soluble in solutions and will form solid precipitates. However, if too much HCl was added during this step, AgCl (s) and PbCl 2 (s) would join with additional Cl - ions to form soluble aqueous compounds, unable to precipitate. The cation mixture and HCl were centrifuged, and an additional drop of hydrochloric acid was placed in the test tube to guarantee each cation would precipitate. Lead(II) chloride, unlike Hg
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Discussion4 - Lauren Taranow 10-9-11 Unique: 51070 lmt827...

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