Question

what is vant hoff factor and how I related to alpha in the case of binary electrolyte​

Answer 1

Answer:

Van't Hoffs factor (i) : "It is defined as the ratio of the observed value of colligative property to the theoretical value of colligative property".

I=experimental values of colligative propertycalculated value of colligative property

Solute dissociation or ionization process : If a solute on ionization gives 'n' ions and 'α' is degree of ionization at the given concentration, we will have [1+(n−1)α] particles.

(1−α)⇔nα

Total 1−α+nα=[1+(n−1)α]

∴ i=[1+(n−1)α]1

α=i−1n−1 αionization=i−1n−1

Solute association process :

If 'n'A molecules combine to give An, we have

nA⇔An

If 'α' is degree of association at the given concentration.

1−α=αn =1−α+αn

i=1−α+αn1

Or

α=1−i1−1n αdissociation=1−i1−1n

Explanation: