Experiment 52A-Identification of Unknowns.docx

Experiment 52A-Identification of Unknowns.docx - Experiment...

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Experiment 52A-Identification of Unknowns The objective of this experiment is to identify an unknown using properties such as structure, solubility, density, etc. A series of solubility tests were performed based on its solubility in H 2 O, HCl, NaOH/NaHCO 3 , and H 2 SO 4 . The figure below was used to determine the identities of the unknown which could have been either 2-napthol, biphenyl, benzophenone, or Benzoic Acid. All of the possible compounds were tested against each solvent to compare the reactions against that of the unknown. All the compounds were first combined with water to test solubility. Compounds that are soluble in water must have four carbons or less, and should contain Oxygen, Nitrogen, or Sulfur. Also branching of the alkyl chain lowers the melting/boiling point and also lowers intermolecular forces. Lowering the intermolecular forces leads to a greater solubility in water. Since all of these compounds are aromatic and therefore nonpolar, they will all be insoluble in water.
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