Ch_322a_11.03

Ch_322a_11.03 - Physical Properties of Alcohols and Ethers...

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Physical Properties of Alcohols and Ethers Alcohols Alcohols contain both hydrophobic ("water-hating") and hydrophilic ("water-loving") structural parts, also called nonpolar and polar parts. R-H alkane hydrophobic O-H H water hydrophilic R - OH alcohol
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Melting Points and Boiling Points The melting and boiling points increase with the size of the R group for straight-chain alcohols. The branched alcohols form a separate sub-group with homologous properties. Solubility in Water The smallest size alcohols (up to C 3 ) are completely soluble in water. Alcohols up to C 8 have limited solubilities. CH 3 OH CH 3 CH 2 OH CH 3 CH 2 CH 2 OH completely soluble CH 3 CH 2 CH 2 CH 2 OH 8.3 g/100 mL CH 3 (CH 2 ) 6 CH 2 OH 0.05 g/100 mL (25 o C)
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Hydrogen-Bonding in Alcohols The physical properties of alcohols are strongly influenced by the ability of alcohols to form intermolecular hydrogen bonds . R-O : H : !" ! + H-O R : !" ! + H-O R : !" ! + H-O R : !" ! + These intermolecular attractive interactions stabilize the liquid
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_11.03 - Physical Properties of Alcohols and Ethers...

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