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Assuming complete dissociation, Calculat...

Assuming complete dissociation, Calculate the expected freezing point of a solution prepared by dissolving 6.0 g of Glauber's salt. `Na_(2)SO_(4). 10H_(2)O` in 0.1 kg of water. (Given value of `K_(f)=1.86 K kg mol^(-1))`.

Text Solution

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Sodiom chloride (Nacl) isa strong electrolyte and dissoviteds as:
`Nacl to Na^(+)+CL^(-)`
`"Van't Hoff factor"(i)("No.of particles aftr dissociation")/("No. of particles originally present")=(1+1)/1=2`
`W_(B)=(DeltaT_(f)xxM_(B)xxW_(A))/(ixxK_(f))`
`i=2, W_(A)=1kg,DeltaT_(f)=3K, K_(f)=1.86 K kg mol^(-1)`
`M_(B)(NaCI)=23+35.5=58.5 g mol^(-1)`
`W_(B)=((3K)xx("58.5g mol^(-1)xx(1 kg)"))/(2xx("1.86K kg mol^(-1)"))=47.2 g`
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