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From what I've read about osmotic pressure, the "measurement" and "calculation" of osmotic pressure always applies to a system in which "pure water" and a solution is separated by a semipermeable membrane.

enter image description here

I can't find a way to measure or calculate the osmotic pressure is both sides are solutions.

And I also can't figure out if water contacts two solutions at the same time, will the osmotic pressure be independent of each other? ( What I mean is like the picture below, but with two cylinders in the water. enter image description here

Is there any textbook that discuss these kind of situations?

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  • $\begingroup$ Just take two solutions, for the measurement or calculation. How exactly you could not find the way? $\endgroup$
    – Poutnik
    Commented May 1 at 8:10
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    $\begingroup$ $\Pi=\Delta cRT$, for the net osmotic pressure at the membrane, where delta represents the difference in concentrations. $\endgroup$
    – Dodo
    Commented May 1 at 12:07
  • $\begingroup$ Oh, I wasn't sure I could just use the difference in the concentration. What I read in books was "Π=cRT", so I thought it could only apply to solution-water. Now I get it, thank you! $\endgroup$
    – Wang
    Commented May 1 at 13:49
  • $\begingroup$ Can you recommend a textbook on osmotic pressure? Mine all give "Π=cRT" instead of Π=ΔcRT, maybe my books are only introductions. I want to read further in this topic, thank you. $\endgroup$
    – Wang
    Commented May 1 at 14:40

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