Cations (14.5).docx

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UNIVERSITY OF BALAMAND Faculty of Sciences Department of Chemistry Basic Chemistry Laboratory Names: Lara Frangieh ID: A0810408 Anthony Dahdah ID: A0810784 Experiment Title: Precision of Measurement Experiment Week: Week 8 Date: 26/11/09 Submitted to: Dr. Robin Taleb 1
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Introduction: Group I cations (lead, mercurous, and silver ions) are unique in that they form chloride precipitates that are insoluble in acid. These ions are the only ones that ones that form chlorides with solubility-product constants small enough to enable the us to precipitate them from any other cations that might be present in a sample by the addition of HCl. The reactions involved in the separation are: 2 + ¿ Pb aq ¿ + ¿ 2 Cl aq ¿ PbCl 2 (s) + ¿ Ag aq ¿ + ¿ Cl aq ¿ AgCl 2 (s) 2 + ¿ Hg 2 aq ¿ + ¿ 2 Cl aq ¿ Hg 2 Cl 2 (s) The aims of the experiment were to test the presence of lead, mercurous, and silver ions in a cations solution, and to determine the cations present in an unknown solution of cations. Used equipments: Centrifuge tube 1 ml pipette Beaker Dropper Centrifuge Beaker Heating mantle Litmus paper Used chemicals: 2
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  • Winter '15
  • Amir Alimohammad
  • Chemistry, Ion

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