Lab 5 Acid/Base Extractions
The purpose of this experiment is to separate either the organic base (amine) or organic acid (carboxylic acid) from a mixture that contains inorganic impurities (salt) by performing a liquid-liquid extraction and then taking a melting point. Key Experimental Details and Observations
Our starting material, Compound B, was a fine white powder and weighed 0.535g. The final product was a shiny white sheet that resembled acrylic paint and weighed 0.109g. Results
| Solid Weight 1
| Solid Weight 2
| Solid Weight 3
| Benzoic Acid Literature
| 4-Amino acetophenoneLiterature
| Ethyl AcetateLiterature
| Solid Trial 1
| Solid Trial 2
| Solid Trial 3
| Melting Point
Our percent yield was 0.109g/0.535g x 100 = 20.4%.
Discussion and Conclusions
The melting point ranges we got for compound B ranged from 110.8-114.0 °C, while the melting point range for benzoic acid is 121.0-123.0°C and 103.0-107.0°C for 4-amino acetophenone. Since the ranges we acquired for compound B are directly in between both acid and base melting points, we can conclude that the purity for compound B is relatively high due to the compound being made up of equal parts of benzoic acid and 4-amino acetophenone. Thus saying that our melting point ranges are fairly accurate because they exemplify an equal percentage of both compounds, which is exactly what compound B is made up of. The purity can also be concluded through the melting points depression because depression arises from impurities within the lattice of a crystalized sample.
We acquired a percent yield of 20.4%, which is relatively low. This result could be from part of the compound B solution being left behind in the Erlenmeyer flask when pouring the solution into the vacuum filtrate. The efficiency of a...
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