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van't Hoff factor(i) or Abnormal Colligative Property is considered one the most difficult concept.
Calculation of Extent of Dissociation in an Electrolytic Solution is considered one of the most asked concept.
30 Questions around this concept.
Which one of the following aqueous solutions will exhibit highest boiling point?
We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentration 0.1 M, 0.01 M and 0.001
M, respectively. The value of van 't Hoff factor(i) for these solutions will be in the order :
If is the degree of dissociation of
the Van't Hoff’s factor (i) used for calculating the molecular mass is
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If a solute gets associated or dissociated in a solution, the actual number of particles are different from expected or theoretical consideration.
We know, that:
Thus, we can say that:
Again, we have:
Thus;
van't Hoff Factor for dissociation of solute
Suppose we have the solute A which dissociates into n moles of A. Then the dissociation occurs as follows:
At time t = 0 1 0
At time t = t 1 - n
At time t = 0, initial number of solute particles = 1
And, at time t = t, observed number of solute particles = 1 - + n
= 1 + (n-1)
Thus, we know that:
where n = number of solute particles
= Degree of dissociation
For strong electrolytes, the degree of dissociation is taken to be unity.
Using the above equation, the van’t Hoff factor and the degree of dissociation can be related which can be further related to the theoretical and observed colligative properties.
Suppose we have a solute A and it associates into (A)n. Then the association occurs as follows:
At time t = 0 1 0
At time t = t 1 -
/n
Now, the initial number of solute particles = 1
And, the observed number of solute particles =
Thus, van't Hoff factor is given as:
where, is the degree of association
Using the above equation, the van’t Hoff factor and the degree of association can be related which can be further related to the theoretical and observed colligative properties.
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