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Two solutions A (0.1 M urea, π_A) and B (0.1 M NaCl, π_B). Water flows by osmosis:
AFrom B to A
BFrom A to B
CNo flow
DBoth directions equally
Answer & Solution
Correct answer: B. From A to B
NaCl gives more particles (i=2) → higher π_B. Water flows from lower osmotic pressure to higher (or equivalently, dilution flows toward more concentrated). So water flows from A (less concentrated in particles) to B (more concentrated).
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