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Question
Which of the following combination shows maximum boiling azeotrope?
Which of the following combination shows maximum boiling azeotrope?
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Solution
The correct option is D H2O+HNO3
An azeotropic mixture is a mixture of substances that has the same concentration of vapour and fluid phases. It is basically a mixture that contains two or more liquids. An azeotropic mixture basically has constant or same boiling points and the mixtures’ vapour will also have the same composition as the liquid.
Maximum boiling azeotrope are the liquid mixture which have higher boiling point than its individual components.
In H2O and HNO3 mixture, a strong intermolecular H-bonding exists. Hence, intermolecular force of attraction between H2O and HNO3 increases, which result in decrease in vapour pressure of solution mixture.
Thus,
PT<XA.pA+XB.pB
Hence, this non-ideal solution shows large negative deviation from Raoult’s law. As a result the solution mixture boils at a temperature higher than the boiling point of it components.
Solution mixture (a) and (b) shows minimum boiling azeotrope since their solute solvent interaction is less than solute- solute and solvent -solvent interaction.
Mixture (c) is a ideal solution. Here, the solute solvent interaction is equal to solute- solute and solvent -solvent interaction. This does not form a azeotropic mixture.
An azeotropic mixture is a mixture of substances that has the same concentration of vapour and fluid phases. It is basically a mixture that contains two or more liquids. An azeotropic mixture basically has constant or same boiling points and the mixtures’ vapour will also have the same composition as the liquid.
Maximum boiling azeotrope are the liquid mixture which have higher boiling point than its individual components.
In H2O and HNO3 mixture, a strong intermolecular H-bonding exists. Hence, intermolecular force of attraction between H2O and HNO3 increases, which result in decrease in vapour pressure of solution mixture.
Thus,
PT<XA.pA+XB.pB
Hence, this non-ideal solution shows large negative deviation from Raoult’s law. As a result the solution mixture boils at a temperature higher than the boiling point of it components.
Solution mixture (a) and (b) shows minimum boiling azeotrope since their solute solvent interaction is less than solute- solute and solvent -solvent interaction.
Mixture (c) is a ideal solution. Here, the solute solvent interaction is equal to solute- solute and solvent -solvent interaction. This does not form a azeotropic mixture.
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