1.

Calculate the molalityof NaCl solutionwhoseelevation in boiling pointis equal to thedepressionin freezing point of 0.25 m sodiumcarbonate solutionin waterassumingcompletedissociationof salts. (k_(f) = 1.86 K m^(-1) , k_(b) = 0.52 K m^(-1))

Answer»


SOLUTION :`NaClto NA^(+) + Cl^(-) (i=2)`
`Na_(2)CO_(3)^(2-) (i=3)`
`Delta T_(b) (NACL) = Delta T_(b) (Na_(2)CO_(3))`
` ixx K_(b) xx m = ixx k_(F) xx m`
` 2 xx 0.52 xx m= 3 xx 1.86 xx 0.25`
` m = 1.34` m


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