Hydrogen bond

  • Thread starter hydrogène
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  • #1
i'm writing a lab report of an experiment investigating strenth of hydrogen bond. An excess of cyclohexane was mixed with ethanol and there's a decrease in temperature of the mixture. I was told that upon the addition of cyclohexane, the H bonds between ethanol molecules were broken and I don't know why. C of cyclohexane are probably not electronegative enough to give the H directly bonded to them a delta +ve charge to attract lone pair electron of O from ethanol. Van der Waal's forces between molecules of ethanol and cyclohexane are not strong enough to overcome the H bonds. Can anyone explain to me what had cyclohexane done on the ethanol molecules?? thx a lot~
 

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  • #2
Borek
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I would bet on dilution.


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  • #3
GCT
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Tis an example of negative deviation from Raoult's law. Cyclohexane is interposed between the ethanol molecules reducing the degree of hydrogen bonding...note the difference between intramolecular hydrogen bonding and intermolecular hydrogen bonding.
 
  • #4
GeneralChemTutor said:
Tis an example of negative deviation from Raoult's law. Cyclohexane is interposed between the ethanol molecules reducing the degree of hydrogen bonding...note the difference between intramolecular hydrogen bonding and intermolecular hydrogen bonding.
I haven't learnt this law. Can you say more about it??
 

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