Chemistry of Water: Boiling Time Comparisons

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Discussion Overview

The discussion revolves around the boiling time of water with different solutes, specifically comparing pure water, water with salt dissolved, and water with sugar dissolved. Participants explore the concepts of boiling point elevation and the effects of solutes on boiling times.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant asks about the boiling time of pure water compared to water with salt and sugar, seeking help with a homework problem.
  • Another participant suggests that the original poster should first consider the underlying concepts before seeking help.
  • It is noted that any solvent with a dissolved substance will have a higher boiling point and a lower freezing point than the pure solvent.
  • A participant encourages thinking about the process of vaporization and how dissolved substances affect the ability of liquid molecules to escape into gas.
  • One participant explains that the interactions between solute (salt) and solvent (water) are stronger than the intermolecular interactions in pure water, leading to a rise in boiling point.
  • Another participant mentions the van't Hoff factor and the ordered arrangement of water molecules when solvating salt compared to sugar, hinting at additional complexities in the solution's behavior.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and approaches to the problem, with no consensus on specific boiling times or the exact impact of each solute on boiling point elevation.

Contextual Notes

Participants do not provide specific mathematical calculations or definitive answers regarding the boiling times, leaving assumptions and dependencies on definitions unresolved.

Who May Find This Useful

Students studying chemistry, particularly those interested in colligative properties and the effects of solutes on boiling points.

yeshli2nuts
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i had this problem for homework and i need some help. if i had 1 cup of water compared to 1 cup of water with tablespoon of salt disolved in it, which would take longer, by how much time, and why to bring to a boil? and how about 1 cup of water with a tablespoon of sugar compared to the other two?
thanks a lot. :smile: :smile: :biggrin: :-p
 
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You need to have your thoughts first instead of expecting us to do your homework for you. What concept does this question relate to?
 
Any solvent with dissolved substance boils higher and freezes lower then the pure one.

G
 
Try thinking about what needs to happen for liquid molecules to escape the liquid state and be vaporized into gas. Now, what happens if something is dissolved in it? Try writing out the chemical equation for the dissolution of a salt. Namely, how does the solute affect the new solvent compared to the pure solvent?
 
Because the solute(salt)-solvent(liquid molecule like water) interactions are stronger than liquid intermolecular interactions, some cluster-like structures form in the solution. The stronger trap of the liquid molecule prevent its escape, and leads to the rise of boiling point. Generally, viscosity of very dilute solution increases with concentration of salt. but at medium and higher concentration ranges, the relation is not so simple.
 
additional hint: van't hoff factor and perhaps consider the much more ordered arrangement of water in solvating the salt in comparison to the sugar.
 

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