First slide

Theory of dilute solutions

Question

The Van't Hoff factor for a 0.1 M Al₂(SO₄)₃ solution is 4.20. The degree of dissociation is

Moderate

A

80%
B

90%
C

78%
D

83%

Solution

$A l_{2} {(S O_{4})}_{3} ⇌ 2 A I^{3 +} + 3 S {O_{4}}^{2 -} 1 0 0 1 - α 2 α 3 α i = 1 - α + 2 α + 3 α = 1 + 4 α = 4.2 \Rightarrow α = 0.8$

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