What explains caffeine's higher solubility in dichloromethane compared to water?

  • Thread starter Thread starter slft
  • Start date Start date
  • Tags Tags
    Water
Click For Summary

Discussion Overview

The discussion centers around the solubility of caffeine in dichloromethane compared to water, exploring the underlying reasons for this phenomenon. Participants examine the polarities of the substances involved and the implications for solubility, engaging in both conceptual and technical reasoning.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why caffeine, perceived as more polar than water, is more soluble in dichloromethane, suggesting a contradiction based on dipole moments.
  • Another participant challenges the assumption that caffeine is more polar than water, prompting a discussion about the definitions of polarity.
  • A claim is made that the dipole moment of caffeine is larger than that of water, which is presented as a reason for its solubility characteristics.
  • One participant argues that the size of the caffeine molecule affects its polarity, stating that the large dipole moment does not necessarily indicate high polarity due to charge separation over a larger distance.
  • A follow-up question is raised regarding whether the separation of charges in caffeine leads to independent interactions with other molecules, indicating a need for further clarification on the nature of molecular interactions.

Areas of Agreement / Disagreement

Participants express differing views on the polarity of caffeine relative to water, and the discussion remains unresolved regarding the implications of molecular size and charge separation on solubility.

Contextual Notes

Limitations in the discussion include assumptions about polarity definitions and the complexity of molecular interactions that are not fully explored.

slft
Messages
12
Reaction score
0
Why caffeine is more soluble in dichloromethane than in water?
I thought caffeine is more polar than water and water is more polar than dichloromethane, so shouldn't caffeine is more soluble in water than in dichloromethane, since their dipole moment is closer?
 
Physics news on Phys.org
slft said:
I thought caffeine is more polar than water

Why do you think so?
 
cuz the dipole moment of caffeine is larger than water
 
This is not that simple. Caffeine molecule is much larger, so even small charge is separated over the large distance, which makes dipole moment large - but the molecule is not that polar.

--
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K
Replies
2
Views
8K
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
8K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 34 ·
2
Replies
34
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K