Lab 5 Acid/Base Extractions

Topics: Carboxylic acid, Acid, Acetic acid Pages: 2 (426 words) Published: February 5, 2013
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
Final Weight
Name| Solid Weight 1| Solid Weight 2| Solid Weight 3|
Weight| 0.110g| 0.109g| 0.109g|

Melting Point
Name| Benzoic Acid Literature| 4-Amino acetophenoneLiterature| Ethyl AcetateLiterature| Solid Trial 1| Solid Trial 2| Solid Trial 3| Melting Point| 121.0-123.0°C| 103.0-107.0°C| 83.2-84.8°C| 110.8-113.6°C| 111.1-113.1°C| 113.5-114.0°C|

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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