(a)On the basis of 90% dissociation, 100 particles of sodium
chloride will yield:
90 zinc ions
90 sulfate ions
10 undissociated particles or
190 particles
Because 190 particles represent 1.9 times as many particles as were
present before dissociation, the dissociation (i) factor is
1.9,answer.
Or use formula
Here n= no of moles and @= dissociation degree
Given n=2
@=90%=90/100=0.9
So,
(b)For this we use a simple formula given as
ΔT=i*kf*m
Where is a constant
given as 1.86 for freezing point depression.
i is dissociation factor( calculated above)
ΔT=1.9*1.86*1=3.534
So, freezing point is -3.534°C
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