What would be the value of Van’t Hoff factor for a dilute solution of K2SO4 in water?

The van't hoff actor is an integer based on the number of particles that substance will dissociate into a dilute solution of K2SO4 would dissociate into two K+ ions and a sulfate ion. Therefore the van't hoff factor for a dilute solution of K2SO4 is 3

K2SO4   2K+  + SO42-
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What is expected value of Van’t Hoff factor for K3 [Fe(CN)6] in dilute solution?

solution:
The dissociative equation for K3[Fe(CN6)] can be written as:

 k3 Fe(CN)6  3K++[Fe(CN)6]3-
 
therefore , number of particles after dissiociation = 4
so van't hoff factor =4/1 = 4
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Why is the elivation in boiling point of water different in the following solution?
(i) 0.1 molar NaCl solution.
(ii) 0.1 molar sugar solution.


solution:
The elevation in boiling point depend on the dissociation of particle in solution.
0.1 M NaCl will dissociate into Na
+ and CI whereas 0.1 M sugar solution will not dissociate. The number of particles are more in NaCl, the elevation in boiling point is higher.
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In the determination of molar mass of A+B using a colligative property, what may be the value of Van’t Hoff factor if the solute is 50% dissociated?

α=i-1n-1     0.5 i-1z-1    i = 1.5.
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State the formula relating pressure of a gas with its mole fraction in a liquid solution in contact with it.

solution:

The most commonly used form of Henry’s law states that “the partial pressure of the gas
in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution”


P
gas = Mole fraction gas of gas x KH, where KH is Henry law constant
⇒ p = KH.x where ‘x’ is mole fraction.
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