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Topic: Problem Calculating Osmotic Pressure  (Read 2753 times)

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Offline Carolyng

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Problem Calculating Osmotic Pressure
« on: June 03, 2016, 12:18:32 PM »
Hello; I was wondering of anyone can help me with a question regarding Osmotic Pressure

What is the osmotic pressure in torr of a 0.0115 M glucose at body temperature (37C)?  What are the boiling and freezing points for the same solution.

Thank you
Carolyn 

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Re: Problem Calculating Osmotic Pressure
« Reply #1 on: June 03, 2016, 05:37:44 PM »
You have to show your attempts at solving the problem to receive help, this is a forum policy.

What is the formula for osmotic pressure?
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Offline Carolyng

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Re: Problem Calculating Osmotic Pressure
« Reply #2 on: June 03, 2016, 11:29:52 PM »
You have to show your attempts at solving the problem to receive help, this is a forum policy.

What is the formula for osmotic pressure?

Sorry, I guess I should've been a bit more clear;   I did get the osmotic pressure using nRT and converted atm to torr resulting in 223 torr.

My issue is getting the boiling and freezing points for the solution.   I tried using The Freezing Point Colligative Property;

 detlaTf=Kf m and detltaTb  =Kb m.  The book says I should get Tf=-0.021 and Tb=100.006.  I'm not sure what I'm missing but I'm not getting those answers. 

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Re: Problem Calculating Osmotic Pressure
« Reply #3 on: June 04, 2016, 03:12:20 AM »
The book says I should get Tf=-0.021 and Tb=100.006.  I'm not sure what I'm missing but I'm not getting those answers.

Hard to say why, I got 100.006 °C for boiling.

Show your work and we will start from there.
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Offline Carolyng

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Re: Problem Calculating Osmotic Pressure
« Reply #4 on: June 06, 2016, 08:23:08 PM »
Okay, I did was able to work out the answer.  I was using incorrect calculations.  Thank you all the same.  Cheers.

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