Question

why semipermaible membrane cu2[fe(cN)6] is not used for osmosis is non aqueous solution

Answer 1

cupric ferrocyanide is soluble in non aqueous solvents . hence , semipermeable membrane of [cu2fe(CN)6] can't be used for osmosis in non aqueous solution
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Answer 2

Cupric Ferrocyanide $\bold{\mathrm{Cu}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]}$ is not used for osmosis, because it is non-aqueous solutions even though it is a semipermeable in nature as it is soluble in non-aqueous solutions and the osmosis cannot be performed completely or successfully.

Osmosis is the movement of solvent particles which moves through the semi permeable membrane from regions of higher concentration of solvent to regions of lower concentration of solvent. Cupric Ferrocyanide dissolves to form cyanides of alkalis in non-aqueous mediums.