CBSE Class 12-science Answered
what is the difference between degree of dissociation and degree of association? please
add formulas for both...
Asked by yashrajgharte24.12dgatl | 20 Jul, 2021, 02:34: PM
Expert Answer
Association:
- Consider an example of association of acetic acid. Molecules of acetic acid dimerise in benzenedue to hydrogen bonding. In this case, the number of particles is reduced due to dimerisation.
- If all the molecules of ethanoic acid associate in benzene, then ΔTb or ΔTf for ethanoic acid will behalf of the normal value.
- The molar mass calculated on the basis of this ΔTb or ΔTf will therefore be twice the expectedvalue.
- Such a molar mass that is either lower or higher than the expected or normal value is calledabnormal molar mass.
Dissociation:
- If we dissolve one mole of KCl (74.5 g) in water, we expect one mole each of K+and Cl−ions to bereleased in the solution.
- If this happens, then there would be two moles of particles in the solution. If we did not know about the degree of dissociation, then we could be led to conclude that themass of 2 mol particles is 74.5 g and the mass of one mole of KCl would be 37.25 g.
- In the dissociation of the solute into ions, the experimentally determined molar mass is alwayslower than the true value.
Answered by Ramandeep | 20 Jul, 2021, 07:55: PM
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