Separating Cherry Cola - Observation Sheet

Separating Cherry Cola
Observation Sheet Answer Key
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The student observations sheets should look something like this:

- Observations

First observations Carbon dioxide begins escaping even before heating begins. Tiny bubbles of CO₂ are emitted, and this bubbling becomes more vigorous as heating continues, but well before boiling begins. No vapors occur, and no condensation occurs yet. Little or no odor can be detected yet also.

First reaction to heating As the liquid gets hotter, the bubbles of carbon dioxide become even more noticeable, both more vigorous and slightly larger. Tiny bubbles continue, but no liquid accumulates in the smaller receiving flask. No vapors are seen, and no condensation occurs yet. Odor may be slightly stronger, but not much.

Lime water test 1 The lime water begins clear but slowly turns cloudy. This is a test for carbon dioxide, and it shows CO₂ is being released from the boiling flask; however, no liquid is being transferred into the receiving flask. This indicates no extraction is yet happening.

Continued heating Gradually the smaller bubbles of CO₂ give way to larger bubbles of liquid (water), and vapors rise and are condensed into the receiving flask. These vapors form drops of clear, colorless liquid in the flask in the ice bath. More odor is noticeable now as the volatile oil is driven off.

Lime water test 2 By this time, very little, if any, cloudiness forms in the lime water. The lime water remains relatively clear and colorless.

Final heating/end Not much to notice here, except maybe that the remaining liquid in the boiling flask is somewhat darker than it was before. The odor is almost completely gone now as that component has left the boiling flask. It has also evaporated from the receiving flask, so little is detected there.

Comparison of liquid extracted by boiling to liquid left in boiling flask The extracted liquid in the receiving flask is clear and colorless, whereas the liquid remaining in the boiling flask is still the same as it was in the beginning, except that it should be even darker than it was in the beginning, and the odor has left.

Comparison of liquid left in boiling flask to original soda The liquid remaining in the boiling flask is darker than the original soda, indicating that we have concentrated the color due to much of the solvent being extracted (distilled) out of the original solution.

-	Observations
First observations	Carbon dioxide begins escaping even before heating begins. Tiny bubbles of CO₂ are emitted, and this bubbling becomes more vigorous as heating continues, but well before boiling begins. No vapors occur, and no condensation occurs yet. Little or no odor can be detected yet also.
First reaction to heating	As the liquid gets hotter, the bubbles of carbon dioxide become even more noticeable, both more vigorous and slightly larger. Tiny bubbles continue, but no liquid accumulates in the smaller receiving flask. No vapors are seen, and no condensation occurs yet. Odor may be slightly stronger, but not much.
Lime water test 1	The lime water begins clear but slowly turns cloudy. This is a test for carbon dioxide, and it shows CO₂ is being released from the boiling flask; however, no liquid is being transferred into the receiving flask. This indicates no extraction is yet happening.
Continued heating	Gradually the smaller bubbles of CO₂ give way to larger bubbles of liquid (water), and vapors rise and are condensed into the receiving flask. These vapors form drops of clear, colorless liquid in the flask in the ice bath. More odor is noticeable now as the volatile oil is driven off.
Lime water test 2	By this time, very little, if any, cloudiness forms in the lime water. The lime water remains relatively clear and colorless.
Final heating/end	Not much to notice here, except maybe that the remaining liquid in the boiling flask is somewhat darker than it was before. The odor is almost completely gone now as that component has left the boiling flask. It has also evaporated from the receiving flask, so little is detected there.
Comparison of liquid extracted by boiling to liquid left in boiling flask	The extracted liquid in the receiving flask is clear and colorless, whereas the liquid remaining in the boiling flask is still the same as it was in the beginning, except that it should be even darker than it was in the beginning, and the odor has left.
Comparison of liquid left in boiling flask to original soda	The liquid remaining in the boiling flask is darker than the original soda, indicating that we have concentrated the color due to much of the solvent being extracted (distilled) out of the original solution.