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Topic: How to tell what solute will raise the boiling point of a liquid the most.  (Read 13693 times)

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Offline nate2612

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How to tell what solute will raise the boiling point of a liquid the most.
« on: February 27, 2008, 05:35:37 PM »
What solute will raise a liquid's boiling point the most, assuming that the concentration of each solute is the same.

NH3, Na3PO4, K2CO3, NaCl

Why?
How can you tell?
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Offline Borek

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #1 on: February 27, 2008, 05:43:32 PM »
Please read forum rules.

Dissociation, colligative properties.
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Offline Arkcon

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #2 on: February 27, 2008, 05:45:00 PM »
Well, lets start with the definition of colligative properties, and see if there's a hint.
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #3 on: February 27, 2008, 05:51:16 PM »
this is what I know
DT = kb m

m = molality of solute = # moles solute / 1000 g solvent

kb = boiling point elevation constant for the liquid.

I don't really understand kb

Does that help me at all?
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Offline Arkcon

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #4 on: February 27, 2008, 05:57:50 PM »
OK, those formulas won't help you, because they don't want a numerical answer -- this time.  I was thinking more along the lines of a textbook definition.
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #5 on: February 27, 2008, 06:00:12 PM »
Any property that depends on the number of solute particles in a solution, but not their identity.

Boiling point elevation - The increase in the boiling point of a solvent that occurs when a non-volatile solute is added to form a solution.


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Offline Arkcon

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #6 on: February 27, 2008, 07:59:43 PM »
Quote from: nate2612 on February 27, 2008, 06:00:12 PM
Any property that depends on the number of solute particles in a solution, but not their identity.

That's what I was looking for.  Now, presumably, one of your options is better than the others, in some way.  How is each (or at least one)  different from the others>
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #7 on: February 27, 2008, 09:54:29 PM »
would I need to deal at all with molarity. It doesn't sound that way but every time I hit a problem like this, somehow we get back to molarity. OR am I looking more at the elements in each compound.
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Offline enahs

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #8 on: February 27, 2008, 10:10:28 PM »
Neither really.

Colligative Properties of ideal solutions depends only on the number of particles in a specific volume.

In other words, the "more stuff" you got in it, the more change in its properties.
So, if they are all of the same concentration; which one will dissociate and give you "more stuff" in solution?
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Offline Arkcon

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #9 on: February 27, 2008, 10:11:43 PM »
Quote from: nate2612 on February 27, 2008, 09:54:29 PM
would I need to deal at all with molarity. It doesn't sound that way but every time I hit a problem like this, somehow we get back to molarity. OR am I looking more at the elements in each compound.

Nope, they said the concentrations are the same.  Also, solubility differences do not come into play, because concentrations are the same.  How are those molecules different from one another, in terms of particles.
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #10 on: February 27, 2008, 10:33:26 PM »
I have no idea
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Offline Arkcon

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #11 on: February 27, 2008, 10:48:47 PM »
Particles, that's a funny word, why use that word, instead of molecules, or atoms?  Check your book on that point.
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #12 on: February 27, 2008, 11:00:35 PM »
Am I looking for the different bonds?
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #13 on: February 27, 2008, 11:11:31 PM »
I really have no idea what I'm doing here
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Offline nate2612

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Re: How to tell what solute will raise the boiling point of a liquid the most.
« Reply #14 on: February 28, 2008, 12:26:08 AM »
NaCl
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