The observed osmotic pressure for a 0 . 10 M solution of Fe ( NH 4 ) 2 ( SO 4 ) 2 at 25 ° C is 10 . 8 atm . The expected and experimental (observed) values of Van't Hoff factor ' i ' will be respectively; ( R = 0 . 082 L atm k - mol - 1 )

Question

The observed osmotic pressure for a 0 . 10 M solution of Fe ( NH 4 ) 2 ( SO 4 ) 2 at 25 ° C is 10 . 8 atm . The expected and experimental (observed) values of Van't Hoff factor ' i ' will be respectively; ( R = 0 . 082 L atm k - mol - 1 ), 4 and 4 . 00, 3 and 5 . 42, 5 and 4 . 42, 5 and 3 . 42

MARKS App · Accepted Answer

π = i C R T. 1 0 . 8 = i × 0 . 1 0 × 0 . 0 8 2 × 2 9 8 i = 1 0 . 8 0 . 1 0 × 0 . 0 8 2 × 2 9 8 = 1 0 . 8 2 . 4 4 3 6 = 1 0 . 8 2 . 4 4 3 8 = 4 . 42 (experimental value) FeSO 4 . NH 4 2 0 · 1 M SO 4 ⟶ Fe aq 2 + 0 1 M + 2 SO 4 aq 2 - 0 · 2 M + 2 NH 4 aq + 0 · 2 M i (expected) = 0 · 5 M 0 · 1 M = 5

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