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Homologous mono-alkyl ethers of ethylene glycol, such as monoethyl glycol (or 2-ethoxyethanol), HOC 2 H 4 OC 2 H 5 , form excellent solvents as they combine to a large extent the solvent properties of alcohols and ethers. The monoethyl and the monomethyl members have the technical names of ethyl cellosolve and methyl cellosolve respectively. Dioxan pTT pT_T (or diethylene dioxide) O<^pTT 2 pir 2 /O, and dimethylformamide, HCON(CH3)2, also possess exceptional solvent properties. The alkylglycols, dioxan and dimethyl-formamide should be used with caution, however, as their hot vapours are poisonous.

35° Inflammable Avoid when possible (see below). 56° ,, Should preferably be dried before use. p. , as impurities. METHODS AND MANIPULATION Solvent. B. P. Acetic acid (glacial) 118° Inflammability. Not readily inflammable Ethanol (a) Absolute ethanol. Anhydrous, but contains some benzene from azeotropic distillation of (b) with benzene. (b) Rectified ethanol, contains 95-6% ethanol, 4'4°o water. Care in using it with hygroscopic substances. ], contains 95 vols of (6) and 5 vols of wood naphtha.

Before filtration is complete. Both these difficulties can usually be overcome by boiling the solution with a small quantity of animal charcoal. The latter readily adsorbs such fine suspensions, and the hot solution can then be filtered clearly and rapidly through the Buchner funnel. Sublimation. This process is occasionally used for the purification of solid organic compounds. Its use is necessarily limited to those compounds which on heating pass readily and directly from the solid to the vapour state, with a subsequent ready reversal of this process when the vapour is cooled.

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