Organic chem 1 post lab Report

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Introduction In this experiment, several analgesics were analyzed by Thin Layer Chromatography (TLC) and the composition of an unknown tablet was identified. We define chromatography as the separation of two or more compounds or ions by their molecular interactions by either a moving or a stationary phase. 1 There are different types of chromatography: Thin Layer Chromatography (TLC), Gas Liquid Chromatography (GC), and Column Chromatography (CC). All of which there two phases: mobile and stationary.

Phases can be a solid and a liquid, a liquid and a liquid, a gas and a solid, or a gas and a liquid. The stationary phase is also known as the absorbent. Greater affinity, or attraction, for the mobile phases will move faster and conversely for stationary phases. 2 Running a solvent past the absorbent complex in order to remove analytes from the absorbent is known as elution. This process aids in determining affinity. 3 The most polar compound is always the absorbent; however, the polarity of the compounds in the mixture in addition to the solvents found in the mixture differs in polarities.

We use chromatography, or more specifically TLC, to determine the relative amounts of components in a mixture. Additionally TLC is utilized to determine the identity of two substances. When utilizing TLC, the ratio of distance traveled by the compound to the solvent is defined as Rf. 1 Column Chromatography, is used in this experiment to separate ? -carotene from a mixture. Column Chromatography is utilized for purification of both solids and liquids. Primarily, CC is used to separate and isolate compounds.

The similarities between TLC and CC include the utilization of a chamber and UV light to identify the affinity of the compounds. The steps found during a TLC can also be found in a CC. Differences include the extraction and purification procedure found in a CC. Results Thin Layer Chromatography Compound| Distance (cm)| Acetaminophen| 4. 7| Caffeine| 1. 5| Aspirin| 0| Ibuprofen| 0| Solvent front| 6. 5| Thin Layer Chromatography with unknown Compound| Distance (cm)| Unknown| 1. 5| Thin Layer Chromatography comparison Compound| Distance (cm)| Residue| 0| Isolated ?

-carotene| 0| Standard ? -carotene| 0| Calculations Rf = Distance traveled by the compound / Distance traveled by solvent Rf Acetaminophen = 4. 7cm / 6. 5cm = 0. 7 Rf Caffeine = 1. 5cm / 6. 5cm = 0. 2 Rf Aspirin = 0cm / 6. 5cm = 0 Rf Ibuprofen = 0cm / 6. 5cm = 0 Rf Unknown = 1. 5cm / 6. 5cm = 0. 2 Discussion The experimental results indicate that the identity of the unknown tablet was determined by measuring and comparing the distance traveled by the known standards to the unknown standard. The Rf value of Caffeine was 0. 2 and of the unknown was also 0.

2 as shown by the calculations above, this proves that the unknown substance was Caffeine, given that the unknown substance traveled 1. 5cm and was equal to the distance traveled by Caffeine, showing that they were the same. Acetaminophen had a Rf value of 0. 7 with Aspirin having a Rf value of 0 and Ibuprofen also having a Rf value of 0. This shows that the unknown tablet was Caffeine. Yes, the column chromatography experiment was successful as the residue, isolated and standard ? -carotene did not move from the baseline so all the three dots did not move.

This shows that they must be similar, we could have used a better solvent than hexane to show reliable results. Conclusion The TLC successfully exhibited the different affinities of the analgesics. The Rf values were successfully obtained and due to the different affinities, the unknown standard was identified. However, the identity of the unknown standard was not easily attainable, there were complications with the experiment. The complications that could have hindered the results, include human error in measuring and observing.

Also, the tools used in this experiment may not have been sterile and the stock solutions may not have been pure solutions. For the column chromatography experiment, the isolated ? -carotene obtained was isolated from the solution, again human error in measuring and observing could have hindered these results. For isolating ? -carotene, the solvent used was hexane but that did not move the components so a better solvent could have been used to show more reliable results and to make the components move from the baseline.

After removing the TLC paper from the solvent, it would dry off very quickly so this could have caused errors in marking the solvent front, this is a human error and can be improved by reducing human error and improving accuracy with doing measurements.

References: 1) Weldegirma, S. Experimental Organic Chemistry Laboratory Manual: CHM 2210l and CHM 2211L Fall 2011/ Spring 2012; Mason OH, 2010; pp 4-8. 2) Wikipedia. com Affinity. http://en. wikipedia. org/wiki/Affinity (accessed September 19,2011) 3) Wikipedia. com Elution. http://en. wikipedia. org/wiki/Elution (accessed September 19, 2011).

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Introduction/Background: Flavonoids are an important group of additives that can be defined as pure substances either natural, extracted from …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Using the thin layer chromatography the major components of a commercial analgesic tablet will be indentified and purified. The …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Introduction: In this experiment, a mixture of two compounds, cyclohexane and toluene, was separated into fractions by the techniques …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Introduction: In this experiment, a mixture of two compounds, cyclohexane and toluene, was separated into fractions by the techniques …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Abstract: In this experiment, a thin-layer chromatography (TLC) was used to determine the composition of various over-the-counter analgesics. (ACETAMINOPHEN, …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Introduction: The goal of this experiment was to identify an unknown analgesic drug through the use of thin-layer chromatography. …

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