1.

Calculate the freezing point of a solution containing 8.1 g of HBr in 100g of water, assuming the acid to be 90% ionized. [Given : Molar mass Br = 80 g/mol, `K_(f)` water = 1.86 K kg/mol].

Answer» `HBr to H^(+) + Br^(-)`
`i = 1-alpha+mx`
n=2
`i=1+alpha`
`DeltaT_(f) = iK_(f)m`
`DeltaT_(f) = (1-alpha)1.86 xx (8.1)/(81) xx (1000)/(100)`
`rArr DeltaT_(f) = (1+0.9) xx 1.86 xx (8.1)/(81) xx 10`
`DeltaT_(f) = 3.53`
`T_(f)^(@) = 0^(@)C`
`DeltaT_(f) = T_(f)^(@) - T_(f)`
`T_(f) = -3.534^(@)C`


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