What Bonds Break in Benzoic Acid When It Melts?

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SUMMARY

When benzoic acid transitions from solid to liquid, the primary bonds broken are the intermolecular forces, specifically the Van der Waals' forces that exist between the dimeric structures formed by carboxylic groups. In the solid phase, benzoic acid predominantly exists as dimers due to hydrogen bonding, which is disrupted upon melting. This phase change results in a decrease in the number of hydrogen bonds, similar to the behavior observed in water, where hydrogen bonds are reduced from four in solid ice to an average of three in liquid form.

PREREQUISITES
  • Understanding of intermolecular forces, specifically Van der Waals' forces
  • Knowledge of hydrogen bonding and its role in molecular interactions
  • Familiarity with the concept of dimers in organic chemistry
  • Basic principles of phase transitions in chemistry
NEXT STEPS
  • Research the role of hydrogen bonding in organic compounds
  • Explore the concept of dimers and their significance in molecular chemistry
  • Study phase transitions and the thermodynamics involved in melting processes
  • Investigate NMR spectroscopy techniques for analyzing molecular structures
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Chemistry students, organic chemists, and researchers interested in molecular interactions and phase transitions of organic compounds.

Yngevege
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Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.

I know that benzoic acid makes dimers (though only in gas phase, some say?) and that they have Van der Waals' forces between their rings. I tried to use my knowledge about water: Water have 4 hydrogen bonds in solid phase but less in liquid (avg 3,4?), does the same apply to benzoic acid?

Does anyone have any qualified guesses?:shy:

Basically I want to know which bondings are broken when going from the solid phase to the liquid phase.
 
Last edited:
Chemistry news on Phys.org
The dimer is through the carboxylic groups. It is seen in the NMR if the right solvent is chosen.
 

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