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The observed depression in freezing poin...

The observed depression in freezing point of water for a particular solution is `0.093^(@)C`. Calculate the concentration of the solution in molality. Given that molal depression constant for water is 1.86 K kg`"mol"^(-1)`.

Text Solution

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`DeltaT_f = 0.093^(@) C = 0.093K`
m=?
`K_f` = 1.86K kg `"mol"^-1`
`DeltaT`=`K_f`.m
`therefore` m=`(DeltaT_f)/(K_f)`
`(0.093K)/(1.86)` K kg `"mol"^-1`
0.5 mol `kg^-1`
=0.05 m.
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