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What role do the molecular interactions ...

What role do the molecular interactions play in a solution of alcohol and water ?

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In a solution of alcohol and water the molecular interactions present are hydrogen bondings. When these components are mixed then new hydrogen bonds develop between alcohol and water. The formed forces are weaker. Due to the decrease of magnitude of attractive forces, the solution shows positive deviation from Raoult's law. This leads to increase of vapour pressure of solution and decrease in its boiling point.
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