extraction (1)

extraction (1) - properties required for two solvents to be...

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E XP E R I M E N T : E X T R A C T I O N Name _______________________________________ Instructor ____________________________________ Chem ____________ Section/Color ______________ Date ________________________________________ Laboratory Questions Page 2 These questions are to be completed and turned in with the Laboratory Report. P OS T -L A B Q U ES T I O NS 1. Indicate the expected solubility (soluble, insoluble, slightly soluble) of each of the following compounds in a) water and b) hexane. (Check your intuition by finding solubilities at www.chemfinder.com ) Does a chemist mean a solubility of 0.00g/L when they say insoluble? CH 3 CH 2 OH (ethanol) CH 3 CH 2 OCH 2 CH 3 (diethyl ether) CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 (heptane) 2. Why is it not possible to use ethanol to extract an organic compound from water even though most organics are more soluble in ethanol than in water? Hint: Think about the solubility properties of ethanol in water, and the
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Unformatted text preview: properties required for two solvents to be used in an extraction. 3. Phenols, unlike simple alkyl alcohols, are acidic enough to react with sodium hydroxide. Explain how a compound like eugenol, shown below, could be separated from a mixture or organic compounds with no significant acidity. (Hint: See McMurry, p. 605; Draw the product of eugenol and sodium hydroxide and remember that ionic salts are often quite water soluble.) O OH eugenol Water---------Soluble Insoluble Insoluble Hexane---------Slightly Soluble Soluble Soluble This is a subjective question. I'm pretty lenient on answers. EtOH and Water are fully miscible, and do not form layers at any concentration ratio. This question forms the basis for the Natural Products and Alkenes lab later this semester. The procedure can be found there. 2 pt 1 pt 2 pt...
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