1.

Calculate the freezing pint of a solution contaning 0.5g KCl ( Molar mass = 74.5g//mol) dissolved in 100 g water , assuming KCl to be 92% ionised . K_(f) of water = 1.86Kkg/mol.

Answer»

Solution : `KClrightarrowK^(+)+Cl^(-)`
n=2
`i=1-alpha+nalpha`
`i=1+alpha`
APPLYING the reaction
`DeltaT_(F)=iK_(f)m`
`=(1+0.92)xx1.86xx(0.5xx1000)/(7.4.5xx100)`
`DeltaT_(f)= 0.24`
`DeltaT_(f)= t_(f)^(o)=T_(f)`or `t_(f)= -0.24@C`


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