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mL beaker and begin heating the water with a hot plate immediately upon entering
3. Accurately weigh 2.4 grams of CoCl2.6H2O(s) and place it in a 50 mL Erlenmeyer
flask. Add 8 mL of deionized water to dissolve. Do the next step in the fumehood.
After the entire solid has dissolved add 8 mL of the ligand ethylenediamine (C2N2H8)
to the cobalt solution. Carefully make observations regarding any color or
temperature changes and record these in your notebook.
Question A: Explain why the color changes occur during this reaction.
Question B: Write a balanced chemical equation for this process. The product is
4. Return to the laboratory bench with your cobalt solution and make 12 mL of a 10%
H2O2 solution from a 30% H2O2 stock solution. Slowly add 8 mL of the 10% H2O2 to
the cobalt solution. Let the flask sit for 5 minutes at room temperature with
occasional swirling and note any color or temperature changes. Transfer the solution
to your small casserole. Rinse the flask with 8 mL of deionized water and add this
rinse solution to the solution in the casserole. 41 Question C: Ex...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07