First slide

Theory of dilute solutions

Question

A decimolar solution of $K_{4} [Fe {(CN)}_{6}]$ at 300K is 50% dissociated, then its osmotic pressure is _________

Moderate

A

7.38 atm
B

3.61 atm
C

21.34 atm
D

12.32 atm

Solution

$\underset{1 - α}{K_{4} [Fe {(CN)}_{6}]} \to \underset{4 α}{4 K^{+}} + \underset{α}{{[Fe {(CN)}_{6}]}^{- 4}}$
$i = (1 + 4 α) = 3$
$T_{1} = 3 \times 0 .1 \times \frac{1}{12} \times 300$
7.38 atm

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