Comprehension \( \quad: \) The experimental values of colligative properties of many solutes in ...

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Comprehension \( \quad: \) The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.

However in same cases, the experimental value of colligative property differ widely than those obtained by calculation. Such experimental values of colligative properties are known as Abnormal values of colligative property. Cause for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of \( \mathrm{KCl}, \mathrm{NaCl} \) etc. in \( \mathrm{H}_{2} \mathrm{O} \).
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene
If degree of dissociation of an electrolyte \( \mathrm{A}_{2} \mathrm{~B}_{3} \) is \( 25 \% \) in a solvent, then
(a) Normal boiling point = Experimental boiling point
(b) Normal freezing point \( \) Experimental freezing point
(c) Normal osmotic pressure \( =1 / 2 \) Experimental osmotic pressure
(d) Normal molecular weight \( = \) Experimental molecular weight
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