Qualitative Analysis of Anions Overview Getting Started Techniques Procedure FAQ Full Lab Manual Introduction & Goals Chemistry & Background Key Questions Prelab Problems Safety Procedure In Your Write-up Experiments Index ChemLab Home		Prelab Problems 1. Complete and balance the following equation: CH3CO2H(aq) + NaHCO3(aq) --> 2. Complete and balance the following equation: BaCl2(aq)+ H2SO4(aq) --> 3. Complete and balance the following equation: AgNO3(aq) + NaI(aq) --> 4. Draw a flowchart for the analysis of an unknown sample. Start with the addition of H2SO4 to the sample and draw arrows for the possible results and conclusions that can be drawn. Include confirmation tests for each possible ion and balanced chemical equations. Below is a partial chart to help you get started. 5. If you had gotten a single solid sample in your test tube, but couldn't remember if it was NaCl or Na2CO3, how could you test the powder and decide which substance was present? 6. Use the web applet Qualitative Analysis of Anions to test a web-based unknown sample. Practice with known samples and unknowns that you can reveal before trying a "true unknown". Follow the procedure and use your flowchart from prelab problem 4. In your lab notebook, record the code number of your "true unknown" and its identity for your TA to grade. Like all prelab problems, this one should be done independently, not in collaboration with a lab partner or friend. You can access the applet by clicking on the link below. Qualitative Analysis of Anions Applet
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