Answer to Question #165784 in General Chemistry for Phyroe

Question #165784

Assuming that the following salt solution have effective ion concentration equal to the actual salt concentration determine the approximate freezing point of the solution: 

 A 0.1 F potassium sulfate solution.


1
Expert's answer
2021-03-15T09:03:57-0400

"\\Delta T_f=i\u00d7m\u00d7K_f...... (i)"


where "\\Delta T_f"  is the freezing point depression,i is the vanhoff's factor, m is the molality of the solute and "K_f"  is the freezing point depression constant

here value of Kf for water is 1.86 , m is 0.1

now calculating value of "i"

As potassium sulfate solution will undergo 100 % dissociation


So the total 3 ions are formed on 100% dissociation so value of "i" =3


Substituting these values in the equation (1) we get "\\Delta T_f=3\u00d70.1\u00d71.86=0.558\u00b0C"


Freezing point ="T_f-\\Delta T_f =(0-0.558) \u00b0C"


"=-0.558\u00b0C"


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