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What is a semi-permeable membrane?

Answer:

A membrane is a thin layer that may or may not allow particles to pass through it. Permeable is defined as a membrane that can be crossed by particles, ions, or water. 
Semi permeable means, It is a membrane which permits the solvent molecules but not solute molecules to pass through it from a dilute solution to concentrated solution. Example: A film of gelatinous precipitate of cupric ferrocyanide, Cu[Fe(CN)6].
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