Question

note on minimum boiling azeotropes and maximum boiling azeotrope ...

Answer 1

hey mate ur ans
at first Azeotrope
Azeotropes are a mixture of two of more liquids which cannot be seperated by simple distillation and the mixture behaves as a pure liquid having a fixed boiling point. This happens as the composion of the vapour phase and the liquid phase are the same. They are are of two types-

1) Minumum boiling azeotropes: The main characteristics of this azeotrope are-

The boiling point of this azeotrope is lower than the boiling points of its constituents

The interaction between the solvent-solvent and solute-solute molecules are weaker than solvent-solute molecules which results in their low boiling point

Volume of the solution is higher than the sum of the invididual volumes of the constituents because of low solute-solvent molecular interaction.

Enthalpy of the mixture of its constituents is positive.

96% ethanol solution forms a minimum boiling azeotrope.

2) Maximum boiling azeotropes-: The main characteristics of this azeotrope are-

The boiling point of this azeotrope is higher than the boiling points of its constituents

The interaction between the solvent-solvent and solute-solute molecules are stronger than solvent-solute molecules which results in their high boiling point

Volume of the solution is higher than the sum of the invididual volumes of the constituents because of high solute-solvent molecular interaction.

Enthalpy of the mixture of its constituents is negative.

68% nitric acid solution forms a maximum boiling azeotrope

Answer 2

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Category: Science

26 Apr 2013 22:31

Anubhav Gupta

Points:2

How to distinguish between Minimum Boiling Azeotrope and Maximum Boiling Azeotrope ?


Do you want to know how to distinguish between Minimum Boiling Azeotrope and Maximum Boiling Azeotrope? Learn more about the differences between Minimum Boiling Azeotrope and Maximum Boiling Azeotrope here.

Some liquids on mixing form azeotropes which are binary mixtures having same composition in liquid and vapour phase and boil at constant temperature. There are two types of azeotropes called as minimum boiling azeotrope and maximum boiling azeotrope.

#103554

27 Apr 2013 21:22

Lienda

Points:3 (Rs3)

There are two types of solutions, one is Ideal Solutions which follows the Raoult's law and the other is Non Ideal Solutions which doesn't follows the Raoult's. Within non-ideal solutions, some solutions show positive deviation, in which the intermolecular force of attraction between the solute-solute and solvent-solvent are more stronger than solute-solvent interaction and others show negative deviation, in which the intermolecular force of attraction between the solute-solute and solvent-solvent are weaker than solute-solvent interaction. Non ideal binary solution of two liquids showing Positive Deviation are known as Minimum Boiling Azeotrope. For example a binary solution of ethanol and water is consider a Minimum Boiling Azeotrope and those Non Ideal solutions which show Negative Deviation are known as Maximum Boiling Azeotrope. For example a mixture of water and nitric acid is consider a Maximum Boiling Azeotrope.Regards
Lienda
"When winter comes, can spring be far behind"

#103569

28 Apr 2013 03:34

Soumyadip Saha

Points:6 (Rs5)

Azeotropes are a mixture of two of more liquids which cannot be seperated by simple distillation and the mixture behaves as a pure liquid having a fixed boiling point. This happens as the composion of the vapour phase and the liquid phase are the same. They are are of two types-

Minumum boiling azeotropes: The main characteristics of this azeotrope are-
The boiling point of this azeotrope is lower than the boiling points of its constituents
The interaction between the solvent-solvent and solute-solute molecules are weaker than solvent-solute molecules which results in their low boiling point.
Volume of the solution is higher than the sum of the invididual volumes of the constituents because of low solute-solvent molecular interaction.
Enthalpy of the mixture of its constituents is positive.
96% ethanol solution forms a minimum boiling azeotrope.

Maximum boiling azeotropes-: The main characteristics of this azeotrope are-
The boiling point of this azeotrope is higher than the boiling points of its constituents
The interaction between the solvent-solvent and solute-solute molecules are stronger than solvent-solute molecules which results in their high boiling point
Volume of the solution is higher than the sum of the invididual volumes of the constituents because of high solute-solvent molecular interaction.
Enthalpy of the mixture of its constituents is negative.
68% nitric acid solution forms a maximum boiling azeotrope.

hope it may help you ☺