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- Give answer! Which of the following salt has the same value of Van't Hoff factor i as that of K3[ Fe(CN )6 ]
Which of the following salt has the same value of Van't Hoff factor i as that of K3[ Fe(CN )6 ]
- Option 1)
Al 2(SO4)3
- Option 2)
NaCl
- Option 3)
Na2SO4
- Option 4)
Al(NO3)3
Answers (3)
As we learned
Vant Hoff factor for dissociation -
number of particles associated
degree of association
e.g. Carboxylic acid dimerized in non polar solvents like Hexane.
- wherein
n = 2 for dimerization
n = 3 for trimerization
K4[ Fe(CN)6] dissociates as 4K+ + [Fe(CN )6 ]4- , thus 1 molecule dissociates into five particles in the similar way Al2 (SO4 )3 also gives five particles per molecule.
Option 1)
Al 2(SO4)3
Option 2)
NaCl
Option 3)
Na2SO4
Option 4)
Al(NO3)3
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answer is option 4
as it is ionised it disassociates as 3K +Fe [CN]6 NOW vant hoff factor is 3+1=4
similarly Al(NO3)3 ionises to get Al+3NO3 again vant hoff factor is 4
