Lab 5 - Qualitative Analysis

Wash your hands if you think you have spilled

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Unformatted text preview: an them up immediately. Wash your hands if you think you have spilled solution on them, and certainly before leaving lab. Avoid putting anything in your mouth while in lab, ex. chewing on fingernails, pens and pencils. Silver solution will form dark spots on skin if spilled. The spots will not appear for about 24 hours, as the ions are slowly reduced to the metal. They are not hazardous, and will fade in a few days. Waste Disposal All solutions used or produced in this experiment must go into the wast e cont ainer, as they all potentially contain heavy metal cations. Label a 250 mL beaker as a waste container for use at your bench. Empty it into the lab waste container when you have finished your work, then rinse it with a few mL of water. These rinsings should also go into the lab waste container. Afterwards, the test tubes can be washed with soap and water in the sink. The solids should also go into the waste container; nothing s hould go into the s ink. Prior to Class Please read the following section of the Introductory Material: • Centrifuge Lab Procedure Please print the worksheet for this lab. You will need this sheet to record your data. Determine among four students which pair will perform Parts A and B, and which pair will perform Parts C and D. Part A: Confirmatory Tes ts for Individual Ions In a ceramic well plate, put three drops of each metal solution, one solution per well. Add 2 drops of 0.2 M KI to each. Record your observations in Data Table A for the well plate solution (solid? color? etc.). The remainder of the entries in Data Table A will be completed during Part B of the experiment. www.webassig n.net/ebooks/wsug encheml1/lab_5/manual.html 3/6 4/15/13 Lab 5 - Qualitative Analysis Part B: Tes ts with Individual Ions . Sol ubi l i t y i n HCl 1 Place approximately 75 mL of tap water in a 100 mL beaker. Place the wire insert in the beaker. Place the beaker on the hot plate and heat the water to a gentle boil. 2 Label three small, clean test tubes with the symbols of the cations in this experiment, Ag1...
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