1.

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (Delta T_(f)), when 0.01 mol of sodium sulphate is dissolved in 1 kg of water, is ( K_(f)=1.86 "K kg mol"^(-1) ) :

Answer»

0.0744 K
0.0186 K
0.0372 K
0.0558 K

Solution :For complete DISSOCIATION of `Na_(2)SO_(4)`
`Na_(2)SO_(4) RARR 2NA^(+)+SO_(4)^(2-)`
`i=3`
`m=(0.01)/(1)xx1=0.01`
`DeltaT_(F)=iK_(f)m=3xx1.86xx0.01`
`DeltaT_(f)=0.0558`.


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