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Calculate the freezing point of a soluti...

Calculate the freezing point of a solution containing `0.5 ` g KCl (Molar mass = `74.5 ` g/mol) dissolved in 100 g water, assuming KCl to be 92% ionized.
`K_(f)` of water = 1.86 K kg/mol.

Text Solution

Verified by Experts

`KCl to K^(+) + Cl^(-)`
n = 2
` i = 1 - alpha + nalpha`
` i = 1 + alpha`
`Delta T_(f) = iK_(f) m`
` = (1+ 0.92) x 1.86 x(0.5x 1000)/(74.5 x 100)`
` DeltaT_(f) = 0. 24`
` Delta T _(f) = 0.24`
` DeltaT_(f)=T_(f)^(0) - T_(f)`
` T'_(f) =- 0.24^(@) C`
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