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June 20, 2013

Homework Help: Chemistry

Posted by David on Tuesday, November 29, 2011 at 12:03am.

The osmotic pressure of a liquid at 320 K is 145 kPa. Calculate the freezing point of the solution.

• Chemistry - DrBob222, Tuesday, November 29, 2011 at 12:19am

Is this a water solution? If not ignore what follows.
pi = MRT. Substitute and solve for molarity, then assume the molality is the same. (Remember to convert kPa to atmospheres.)
Then delta T = Kf*m
Solve for delta T and

• Chemistry - David, Tuesday, November 29, 2011 at 12:21am

the problem does not specify what the liquid is. that is part of my not understanding.

• Chemistry - David, Tuesday, November 29, 2011 at 12:54am

help anyone?

• Chemistry - DrBob222, Tuesday, November 29, 2011 at 12:58am

Wikipedia defines osmotic pressure as follows:
Osmotic pressure is the pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.[1]
Defined in this manner I assume it is water we are talking about as the solvent.
You can read the article here.
http://en.wikipedia.org/wiki/Osmotic_pressure

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