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Ethanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent.Contents.thanol precipitation is a method used to purify and/or concentrate RNA, DNA and polysaccharides such as pectin and xyloglucan from aqueous solutions by adding ethanol as an antisolvent. Contents.
Ethanol, C2H5OH, reacts with organic acids to form esters. Halogenation or Substitution of Ethanol with PCl5. Ethanol reacts with phosphorus pentachloride at room temperature to form hydrogen chloride, ethyl chloride (i.e. chloroethane) and phosphoryl chloride.One mole of ethanol loses one mole of water). When ethanol is mixed with concentrated sulphuric acid with the alcohol in excess and heated to 140 degC, diethyl ether distils over (two moles of ethanol loses one mole of water) .