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In case of electrolyte which dissociates...

In case of electrolyte which dissociates in the solution the van Hoff factor I

A

`gt` unity

B

`lt` unity

C

`=` unity

D

can be `gt` or `lt 1`

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What is the degree of dissociation for Ca(NO_(3))_(2) solution if van't Hoff factor = 2.4 ?

Colligative properties of solution depend upon the number of particles present in solution. Experimental values colligative properties for electrolytes are always higher than these obtained theoretically because electrolyte dissociates to furnish more ions in solution. The ration of experimental values to theoretical values is called as van't Hoff factor (i) . van't Hoff factor for dimerisation of benzoic acid in water, assuming 70% degree of association:

Knowledge Check

  • van't Hoff factor (i)

    A
    Is less than one in case of dissociation
    B
    is more than one in case of association
    C
    i=normal molecular mass /oberved molecular mass
    D
    i=observed molecular mass/normal molecular mass

  • In case a solute associates in solution, the van't Hoff factor,

    A
    `i gt 1`
    B
    `i =1`
    C
    `i lt 1`
    D
    none of these

  • Colligative properties of solution depend upon the number of particles present in solution. Experimental values colligative properties for electrolytes are always higher than these obtained theoretically because electrolyte dissociates to furnish more ions in solution. The ration of experimental values to theoretical values is called as van't Hoff factor (i) . For 1M solution of a weak acid HA , the dissociation constant K in terms of van't Hoff factor:

    A
    `((i-1)^(2))/(i)`
    B
    `(i)/((i-1)^(2))`
    C
    `((i-1)^(2))/((2-i))`
    D
    `((i-1)^(2))/(i)`

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    Colligative properties of a solution depend upon the number of moles of a solute dissolved and do not depend upon the nature of the solute. However, they are applicable only to dilute solutions in which the solutes do not undergo any association or dissociation. For solutes undergoing such changes, van't Hoff introduced a factor, called van't Hoff factor (i). This has helped not only to explain the abnormal molecular masses of such solutes in the solution but has also helped to calculate the degree of association or dissociation. The van't Hoff factor for 0.1 M Ba(NO_(3))_(2) solution is 2.74. The degree of dissociation is

    A solute forms a pentamer when dissolved in a solvent. The van't Hoff factors 'I' for the solute will be :

    For solutes which do not undergo any association or dissociation in a solute, van't Hoff factor (i) will be

    The electrolyte solutions show abnormal colligative porperties.To account for this effect we define a quantity called the Van't Hoff factor given by i=("Actual number of particles in solution after dissociation")/("Number of formula units initially dissolved in solution") i=1 ("for non-electrolytes") igt1 ("for electrolytes, undergoing dissociation") ilt1 ("for solutes, undergoing association") Answer the following questions: Benzoic acid undergoes dimerization in bezene solution. The Van't Hoff factor i for the solutions is

    Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al(SO4)(if all are 100% ionised)?

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