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Author: Subject: solubility of methanol
soma
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[*] posted on 5-12-2017 at 03:40
solubility of methanol


I'm wondering why alkanes like hexane and heptane, etc., are miscible with ethanol or propanol but not miscible in methanol.
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Corrosive Joeseph
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[*] posted on 5-12-2017 at 07:02


You might like this............


"Solubilities of Various Hydrocarbons in Methanol"

ROBERT W. KISER, G. DANA JOHNSON, MARTIN D. SHETLAR
J. Chem. Eng. Data, 1961, 6 (3), pp 338–341
DOI: 10.1021/je00103a009
Publication Date: July 1961"

Attached -


/CJ

Attachment: Solubilities of Various Hydrocarbons in Methanol.pdf (463kB)
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[*] posted on 5-12-2017 at 13:16


Quote: Originally posted by soma  
I'm wondering why alkanes like hexane and heptane, etc., are miscible with ethanol or propanol but not miscible in methanol.

For the same reason they are not soluble in water or glycerine.
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LearnedAmateur
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[*] posted on 6-12-2017 at 05:23


Well it's all to do with the hydrogen bonding from that hydroxyl group. In methanol, it takes up quite a large portion of the molecule and can be considered the predominant form of intermolecular attraction. The larger the alkyl chain, the less hydrogen bonding occurs and more van der Waals interaction is seen - the same type of interaction which allows for liquid hydrocarbons. Since hydrogen bonding is many times stronger, methanol 'pushes out' alkanes in favour of bonding to itself since the CH3 group isn't large enough to provide strong steric hinderance.



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