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Which of the following is Raoult’s law applicable to, in order to determine molar masses correctly?

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in Chemistry – Class 12 by (188k points)
Which of the following is Raoult’s law applicable to, in order to determine molar masses correctly?

(a) Ionic solute in liquid

(b) Non-ionic solute in dilute solution

(c) Non-ionic solute in concentrated solution

(d) Ionic solid in insoluble form in solvent

I had been asked this question in an interview.

My query is from Colligative Properties and Determination of Molar Mass in chapter Solutions of Chemistry – Class 12

1 Answer

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The correct answer is (b) Non-ionic solute in dilute solution

Easiest explanation: In order to determine molar masses correctly, it is essential that the solute is non-volatile, non-ionic and present in dilute form only. If it is ionic one has to account for its van’t Hoff factor, i, for association in concentrated solution and dissociation in dilute solution. Molar masses can only be calculated from dilute solutions containing non-dissociable non-ionic solutes.

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