In another equation, this quantity is found by multiplying (*) molarity by the ideal gas constant, temperature, and the van't Hoff factor.
Differences in this property are measured in the "static" form of one technique for calculating the molecular weight of a polymer. CatÂ·ions attached to dissolved plasma proteins may contribute to an increase in this quantity in the Gibbs-Donnan effect. The difference in one form of this quantity is multiplied by the reflection coefficient in the Starling equation. In another equation, this quantity is found by multiplying (*) molarity by the ideal gas constant, temperature, and the van't Hoff factor. The effects of this property are commonly visualized using two-halves of a dialysis tube and a semipermeable membrane. For 10 points, name this colligative property describing the minimum pressure needed to prevent inward movement of a liquid across a membrane. 
Differences in this property are measured in the "static" form of one technique for calculating the molecular weight of a polymer.
osmotic pressure [or oncotic pressure; prompt on "pressure"; do NOT accept "hydrostatic pressure"] (The technique in clue one is molecular osmometry) 