Surface tension vs Average Bond Strength

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Discussion Overview

The discussion centers around the relationship between surface tension and average bond strength in liquids, particularly focusing on hydrogen bonds in water and how various solutes can affect these properties. The scope includes theoretical considerations, experimental implications, and potential research directions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant inquires whether increasing surface tension affects the average bond strength of a liquid.
  • Another participant suggests that the impact of surface tension on bond strength may depend on the surface to volume ratio, noting that the effect is less significant for bulk liquids compared to fine mists.
  • A participant expresses interest in changing hydrogen bond strength in water for a lab report and mentions researching solutes that alter surface tension without necessarily affecting hydrogen bond formation.
  • Further research directions are proposed, including examining hydrogen bonding in other liquids and exploring concepts related to Lewis acids and bases.
  • One participant posits that acidic solutions may strengthen hydrogen bonds while basic solutions weaken them, using ammonia and hydrogen fluoride as examples to illustrate this point.

Areas of Agreement / Disagreement

Participants present multiple competing views regarding the relationship between surface tension and bond strength, as well as the effects of acidity and basicity on hydrogen bonds. The discussion remains unresolved with no consensus reached.

Contextual Notes

Participants have not fully explored the assumptions underlying the relationship between surface tension and bond strength, nor have they clarified the definitions of terms like "strength" in this context. The discussion also lacks detailed mathematical or experimental frameworks.

Pen Rie
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If you increase the surface tension of a liquid, does it change the average bond strength of the liquid?
 
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Yes. By very much? Depends on surface to volume ratio: for rain drops, bulk liquids, the effect isn't significant; for fine mists it is.
 
Thank you for replying on my posts. I was trying to find out how to change the strength of hydrogen bonds in water for my lab report, and since you mentioned surface tensions of aqueous solutions, I researched which solutions could change surface tension. Based from a quick search, there were a lot of solutes that could be added to water to change its surface tension, but doesn't necessarily cause hydrogen bond formation on the new mixture. How do I execute my research further?
 
Further? You can look at hydrogen bonding in other liquids (alcohols, organic acids, whatever). Three (?) center bonding in boranes. Lewis acids and bases (not necessarily hydrogen bonding, but another very similar effect).
 
it seems like acidic solutions strengthen hydrogen bonds while basic solutions weaken hydrogen bonds. for example, ammonia, a basic solution, has a very weak hydrogen bond while hydrogen fluoride, an acid, has a very strong bond. is this what you mean about lewis acids and bases?
 

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