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The purpose of this experiment was to practice the extraction technique to isolate a substance: caffeine was extracted from tea leaves. This was a technical experiment that used a solvent in combination with a separatory funnel apparatus and vacuum filtration to remove and isolate everything except pure caffeine from the solid mixture (tea).
Molecules | Petroleum ether | Dichloromethane | Caffeine | Water | Sodium Carbonate | Sodium Sulfate |
---|---|---|---|---|---|---|
Structure | ||||||
Molecular Weight (g/mol) | 82.20 | 84.93 | 194.19 | 18.01528 | 105.9888 | 142.04 |
Melting Point (°C) | -73 | -96.7 | 238 | 32 | 851 | 884 |
Boiling Point (°C) | 46-62 | 39.6 | 178 | 100 | 1600 | 1429 |
Density (g/mL) | 0.653 | 1.327 | 1.230 | 1.000 | 2.540 | 2.664 |
Solubility | Insoluble in water, soluble in ethanol | Soluble in water | Miscible in alcohol, diethyl ether | Soluble in both polar and nonpolar solutions | Water soluble | Soluble in water |
Hazard? | Flammable, health hazard, environmental hazard | Nonflammable, health hazard | Nonflammable, nontoxic | Nonflammable, nontoxic | Nonflammable, Health hazards | Nonflammable, Health hazards |
Compound | Quantity |
---|---|
Tea leaves | 4.84 g (2.4192 g + 2.4281 g) |
Petroleum ether | 10 mL |
Dichloromethane | 20 mL |
Caffeine | 0.0252 g |
Sodium Carbonate | 2 g |
Sodium Sulfate | 0.5 g |
Water | 50 mL total |
This experiment was a solid/liquid extraction.
The procedure was carried out as planned.
During separation of the mixture, the emulsion was broken by the use of a glass rod. A significant amount of caffeine was recovered during this extraction: in total, the percent recovery was 0.521%.
The amount of caffeine extracted was 0.521% recovery (0.0252g) from the original mass of 4.84g of tea leaves. Our solute was identified as pure caffeine by the extraction procedure, including the separation funnel and Vacuum filtration technique, that left pure caffeine crystals.
The total amount of caffeine extracted was 0.0252g. Typically, the amount of caffeine in one tea bag is (30-50mg). Using 0.05 g, we had extracted about 25% of our theoretical yield (( frac{0.0252}{0.1 text{g}} times 100 )), which shows the accuracy of our experiment.
Since the highest amount of total caffeine that could have possibly been extracted from the two tea bags was about 110 mg, this demonstrates that there may have been loss of product throughout the procedure. One loss of product could have occurred during separation due to the emulsion layer that we were careful to not include when decanting the aqueous layer.
Caffeine Extraction Lab Report. (2024, Jan 04). Retrieved from https://studymoose.com/document/caffeine-extraction-lab-report
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