SEPARA~1 2 - Separation and identification of a mixture...

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Separation and identification of a mixture containing 1-(3- Aminophenyl) ethanone and Diphenylmethanol Separation Scheme To separate the binary unknowns, their solubility in aqueous as well as organic solvents was determined after which they were separated on the basis of their differential solubilities in different sovents. Solubility Tests For each of the solubity tests 0.1gram of the mixture was treated with 2ml of the solvent and shaken. To perform these tests 8 test tubes were set up each containing 0.1g of the mixture and 2 ml of a different solvent was added to each of the tubes. Water Solubility Test result The mixture did not dissolve in water and remained suspended at the top. The appearance of the precipitates was light yellow. The mixture also did not change the color of the alkacid paper which remained orange. This maybe because the mixture is insoluble in water as we are already told that it contains one neutral and one basic or acidic compound. NaOH Solubility Test result The mixture did not dissolve in NaOH and was seen as yellow snowflake crystals suspended in the solution. This shows that no organic acids are present in the mixture. NaHCO 3 solubility test result The mixture is not soluble in NaHCO 3. The precipitates are yellow in colour and snow flake like in appearance HCl Solubility Test result The mixture is partially soluble in HCl i.e. half the mixture dissolved. The solution had a white and cloudy appearance. This means that the mixture contains an organic base, either an amine or amide. To test further concentrated NaOH was added to the mixture which caused the amount of ppts to increase, i.e. ppts came out which were originally soluble in the acidic solution. Diethyl ether Solubility Test result The mixture dissolves completely forming a colorless solution. Ethyl acetate Solubility Test result The mixture is completely soluble in ethyl acetate forming a colorless solution. Dichloromethane Solubility Test result The mixture is again completely soluble and forms a colorless solution upon dissolving. Hexanes Solubility Test result
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The mixture was not soluble and the crystals were seen to collect at the bottom. On the basis of the above solubility tests and the preliminary IR which showed the
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SEPARA~1 2 - Separation and identification of a mixture...

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