Part III: Equilibrium Involving Cobalt(I) Complexes

1. Place a pea-sized sample (approximately 0.3 g or the tip of a scoopula) of CoCl₂•6H₂O into each of two 100 mL beakers.

2. To the first beaker, add 10 mL of 6.0 M HCl.

3. To the second beaker, add 10 mL of water. Note the colors of the solutions in both beakers and record this information in a neat table.

4. Gradually add water to the solution in the first beaker until a definite color change occurs. Record your observations in your table.

5. Place the first beaker on a hotplate and heat gently on medium-low heat. Do not breathe in any fumes. When a definite color change is observed, turn off the heat. Using beaker tongs, carefully lift the beaker from the hotplate. Record the resulting color in your table.

6. Add approximately 50 mL of cold water to a clean 250 mL beaker. Carefully place the warm beaker and its contents from the previous step upright into this cold water bath. Record any further changes in color or intensity in your table.

This question is about equilibrium involving cobalt(II) complexes and describes an experiment to observe color changes in the presence of different reagents. The experiment uses cobalt(II) chloride hexahydrate and hydrochloric acid to create complex ions, and heating or cooling the solutions causes further color changes. The observations provide insights into the equilibrium between the cobalt(II) complexes.

Explanation:

This question is about equilibrium involving cobalt(II) complexes. The experiment involves observing the color changes that occur when cobalt(II) chloride hexahydrate is mixed with hydrochloric acid and water. In the first beaker, the color changes when water is added, indicating the formation of a complex ion. Heating the solution in the first beaker also causes a color change, which is likely due to the formation of a different complex ion. Finally, placing the warm beaker in a cold water bath may cause further changes in color or intensity. All these observations provide insights into the equilibrium between the cobalt(II) complexes in solution.

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