Question #edacf

1 Answer
Junaid Mirza
Nov 28, 2017

lower

Explanation:

Adding a non-volatile solute to a solvent decreases the freezing point of the solvent. This decrease in freezing point is called depression in freezing point.

Depression in freezing point (#DeltaT_f#) is given as

#DeltaT_f = T_f - T_i = -iK_fm#

Where

  • #i# = Van’t Hoff factor
  • #K_f# = Freezing point constant
  • #m# = molality of solution

(-ve sign in the formula indicates that final freezing point is less than initial freezing point)

Van’t Hoff factor of #"NaCl"# is #2# and that of #"MgCl"_2# is #3#. Therefore there is more decrease in freezing point in #"MgCl"_2# solution than that of #"NaCl"# solution.

Freezing point of #"MgCl"_2# solution #<# Freezing point of #"NaCl"# solution

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