Colligative properties

[ysitbon]

Hi everyone!
I was just doing some chem today and I had trouble with the following example.
Why is the answer C and not A?
Thanks everyone!

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[shinsoochoo]

The question states that osmotic potential decreases as osmotic concentration increases. As a result of 1 M of NaCl having a greater osmotic concentration than .9 M NaCl, the former would cause the lowest osmotic potential.

The question I have is that does this relate to the osmotic pressure equation and how so?

 

[Blueprint MCAT Tutor]

Very loosely speaking (and any real chemist would be appalled at the following discussion): you can read "osmotic potential" as "how watery is the solution?"

So a beaker full of pure water would have the highest osmotic potential.

A beaker with water filled with a whole bunch of dissolved crap would have the lowest osmotic potential.

In this question, answer choice (C) has the most junk dissolved in the water - two molar of particles. So it's the least "watery" and has the lowest osmotic potential.