First slide

Theory of dilute solutions

Question

For a given value of degree of dissociation, which of the following have correct Van't Hoff factor?

Moderate

A

NaCl, i=2+ $α$
B

Ca(NO₃)₂, i=1+2 $α$
C

K₄[Fe(CN)₆], i=1+4 $α$
D

(NH₄)₃PO₄ , i=3+ $α$

Solution

The expression to determine van't Hoff factor of a solution is given by:
i=1+(n−1)α
n= number of ions formed after dissociation
α= Degree of dissociation
where, i= van't Hoff factor
A. For NaCl; n=2 so i=1+α
B. For Ca(NO₃)₂; n=3 so i=1+2α
C. For K₄[Fe(CN)₆]; n=5 so i=1+4α
D. For (NH₄)₃PO₄; n=4 so i=1+3α

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