Name: Expressing Concentration by Mass Percent
Uploaded: 2019-07-19
Duration: 3 min 32 s
Description: Mass percentage is a way of representing the concentration of an element in a compound or a component in a mixture. Let us learn more through this video.

Question

What type of deviation from Raoult's Law is expected when phenol and aniline are mixed with each other? What change in the net volume of the mixture is expected? Graphically represent the deviation.

Accepted Answer

Raoult’s Law is a law that says that the partial pressure exerted by a component in a binary mixture is the product of its mole fraction in solution and its vapour pressure as a pure solvent.

A solution of phenol and aniline, when mixed will have a lower vapour pressure than that of the vapour pressure of pure components. This is because of the interaction between aniline and phenol molecules through hydrogen bonding. Since there exists a force of attraction between the molecules in the liquid phase, a lesser amount of both components will be present in the vapour phase and thus, this solution shows a negative deviation from Raoult’s Law. The net volume of the mixture will decrease, $ΔV < 0$ due to stronger intermolecular interactions.

What type of deviation from Raoult's Law is expected when phenol and aniline are mixed with each other? What change in the net volume of the mixture is expected? Graphically represent the deviation.

Important Questions on Solutions

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